I'm no expert but I think people with a 64bit OS will see a small performance increase due to larger amounts of data being able to be shifted around, and systems with more than 4GB of RAM having it utilised. I could be completely wrong, but that is how I understand it anyway. I'm sure someone else could explain it better.
Performance increase is significant - OS code-quality and poor exe ulitization and program otimizations are the reasons that could hold it back, i have not researched this area in particular in detail, i thought about it on my todo list but i always forgot.
The "more to share soon after" doesn't sound platform specific.
DLC = Technically possible on All platforms
SDK (tools,editor) = Practically possible only on PC. (technically impossible due to requirements, vendor policy)
Carmack said that id Studio will be only in x64, because it works with big-size files of virtual textures.
Must have a lot of RAM (4-8+ GB) for work with id Studio.
That's because it needs way more than 4GB RAM - people with x32 OS would not been able to successfully use tools.
You also need to substract PAGEFILE([censored]swap) from your memory commit which is the virtual RAM on HDD - a terribly bad idea for stuff like this - disable it and then you'll get big speed boost - given you have at least 16GB of RAM. (it might work with 8 - i don't really know, but they said "a lot of RAM" and by todays standards 8 is
not a lot)
It would also be nice if it supported the Steam Workshop
Confirmed not - atleast that's what CEO thinks.