Yes AMD will be providing processors for all 3 consoles which isn't a surprise. Intel would charge them a fortune for a chip and their built-in graphics would be awful, nvidia and amd would never allow intel to add their gpu to be added otherwise intel would get all their secrets. So the only option is a cpu by intel/amd/ibm and a gpu by amd/nvidia or an amd apu. AMD apu will be far cheaper initially and in the long term as lower nm processes are released. Nvidia will likely be in list of possibilities for the next gen after this as they will have powerful arm chips by then but currently nvidia is out of the question for the time being.
It will be great for game developers having 1 vendor, they will probably have a similar API and SDK, porting games will likely be much quicker and cheaper.
If the Xbox 720 has a blue ray then I don't really care what PS4 has!
Why? You don't know what the graphics on the next gen are like or their online gaming. The only reason to go for xbox without knowing all of those things is Halo.