Part of this is a driver problem.  This new hardware has drivers in the 3.19 kernel which isn't yet available for 14.04.  This is especially true for your trackpad issues.  You can, however, install the 3.19 kernel using the Beta Kernel Enablement repositories. The next thing I would try doing is just that.  I have a write up/thread about it here:

http://en.community.dell.com/techcenter/os-applications/f/4613/t/19632562

Here is my system info for reference:

gshulegaard@ronin:~$ lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.2 LTS
Release:    14.04
Codename:    trusty
gshulegaard@ronin:~$ uname -a
Linux ronin 3.19.0-18-generic #18~14.04.1-Ubuntu SMP Wed May 20 09:38:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
gshulegaard@ronin:~$

On the 3.19 kernel I do not have WiFi issues, suspend issues, or trackpad issues.  I don't use suspend that much, so it's possible that the suspend issue is still a problem and I just haven't hit it yet.

Thanks for your reply.

I first tried to use the fix from http://www.dell.com/support/article/us/en/19/SLN297219/en.
But that ended up in the right mouse button not working anymore.

I will give 3.19 kernel a try asap.

Do you also experience Wifi problems with channel 12 and 13?
It is probably related to this issue bugs.debian.org/.../bugreport.cgi

I am based in the US so I don't really use channel 12 and 13, however, it would appear that the Broadcom drivers I am using do support channels 12 and 13:

gshulegaard@ronin:~$ sudo iwlist wlan0 f
wlan0     32 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Channel 14 : 2.484 GHz
          Channel 32 : 5.16 GHz
          Channel 34 : 5.17 GHz
          Channel 36 : 5.18 GHz
          Channel 38 : 5.19 GHz
          Channel 40 : 5.2 GHz
          Channel 42 : 5.21 GHz
          Channel 44 : 5.22 GHz
          Channel 46 : 5.23 GHz
          Channel 48 : 5.24 GHz
          Channel 50 : 5.25 GHz
          Channel 52 : 5.26 GHz
          Channel 54 : 5.27 GHz
          Channel 56 : 5.28 GHz
          Channel 58 : 5.29 GHz
          Channel 60 : 5.3 GHz
          Channel 62 : 5.31 GHz
          Channel 64 : 5.32 GHz
          Channel 66 : 5.33 GHz
          Current Frequency:2.412 GHz (Channel 1)

Again, I have never used the channels specifically (at least as far as I am aware), but my drivers are reporting them for support.

For reference, here is my general system information after the 3.19 kernel upgrade:

gshulegaard@ronin:~$ lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.2 LTS
Release:    14.04
Codename:    trusty
gshulegaard@ronin:~$ uname -a
Linux ronin 3.19.0-18-generic #18~14.04.1-Ubuntu SMP Wed May 20 09:38:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
gshulegaard@ronin:~$

@Yoshz and Community,

Regarding the right-click issue: The downloadable files at the below link should be updated next week. This update should include a fix for the right-click issue.

en.community.dell.com/.../20441258

@Yoshz,

Thank you for your post on this. I've sent you a friend request as I'd like to see if I can get you a Dell Ubuntu expert to reach out to you.

Looking forward to hearing from you.

Thanks @DantesRequiem. After I updated to the 3.19 kernel the trackpad problems were gone. However I had to disable "Tap to click" as it triggers while I use the keyboard ("Disable while typing" setting doesn't solve it).

@DELL-Justin C. Very good you guys are working on it. But it would be a good thing if you somehow list the known issues on that page for new users.

The Wifi problem I can't reproduce now as I am not near the channel 12 router the couple of days.
@DantesRequiem, I can list all those channels as well, but when the AP's on channel 12 do not show up when I run "sudo iwlist wlan0 scanning"
But as mentioned earlier, I think it is a driver problem but hope it gets solved soon.

Yoshz,

Thanks again for your post and feedback. We are doing exactly that, see here: http://en.community.dell.com/techcenter/os-applications/f/4613/t/19632338

Keep the feedback coming 

@yoshz, I've got the same Channel 12/13 issue. I've mentioned this in the following unsuitably named thread: http://en.community.dell.com/techcenter/os-applications/f/4613/t/19633153. Still no fix.

@DELL-Justin C, I am suffering the same Channel 12/13 and resume from suspend issues. Since you're trying to get Dell Ubuntu experts in touch with people would you do the same for me? I was told someone from ProSupport would be in touch about my support case raised (911303407) but that's sitting with no response. Also, when is the knowledge base going to materialise? It looks like people have gone off on completely different directions (kernel upgrade in situ, upgrade to 15.04, backporting patches into kernel, replacing broadcom drivers, etc.) so I think it's time to get an official statement from Dell even if it's just "sit tight with 14.04, it's broken but we're going to get 14.04 working fully". I don't want to upgrade to 15.04 only to find it's more work to get any patches you produce deployed.

Regards,
Bob

@Bobmcch,

Thank you for your post here from the 27th. It's my understanding that the Dell EMEA team has reached out to you today.

We've added some new links to the Sticky:

Yesterday: 

Trackpad cursor freezing issue: http://www.dell.com/support/article/us/en/19/SLN297219/en

Today:

May not resume from suspend running 14.04: http://www.dell.com/support/article/SLN297551/en

Unwanted keyboard character repeat: http://www.dell.com/support/article/SLN297563/en

More to come.

Keep the feedback coming.

The trackpad cursor fixes were posted on May 12, not yesterday.  This is confirmed on the download page which shows the upload date as May 12.

The resume from suspend fix is broken.  The downloaded file does not have a proper file format ending and ends up being seen by Ubuntu as a "BIN" file.  Double clicking on it tries to open Archive Manager which then spits out an error.  Appending a ".deb" file ending opens Package Manager, but it reports an error.

Some users have reported that flashing to BIOS A04 doesn't quite resolve the keyboard repeats fully.  I have A04 and seem to notice a repeated character here or there.  Although BIOS A04 did resolved 99% of the issues, so the system is usable.