Area 51-R2, Processor Upgrade Question

Quick question, if I bought the Area 51-R2 with the i7 5820K processor, but later wanted to upgrade the processor...does the motherboard that it would come with, support upgrading to all of the processors you can buy with it on the site? 

For instance, would I be able to install any of the following processors at a later date:

i7 5930k

i7 5960x

i7 6850k

i7 6900k

i7 6950x

Just looking at long term, if I wanted to upgrade making sure the option would be there. I remember reading some people were unable to get the other processors to read..so I'm curious.

Also, is the max supported ram speed 2133? Asking because if I got 16GB 2133 I would likely upgrade it later myself to 32GB and would like 2400mhz or something like that is possible.

Any help would be appreciated!