Why are all new downloads locked at support.emc.com ?

I see the same in the details, but you can look for a product in the main downloads page so, if you search for "Content Server" you'll get to this page where you see the above message

Not very user friendly really...

Edit: now with a screenshot

I don't seen anything at all, just a long list of available versions, but no documents

Nope, it takes some time to repair all these small mistakes.

Thanks for the hint though, have been trying Documentum Foundation Services and Documentum Administrator, which gives a nothing at all.

Your way, we can actually get something

When I access the new downloads section for a product, you can see (at least I can) the following message:

To see additional downloads for this product, click here, or view the Documentum Download Center section for this and other options. (Note: If you are unregistered, please visit the Download Center Registration Link in the Documentum Download Center pod below, or click here, to register.

When you click on the first "click here" you go to the old subscribenet page with all the downloads.