You know you could've just used the Battlefield 4 thread right?
Many games coming out this year and next are requiring x64. I suspected it would happen with the new consoles releasing but I didn't think it'd be this quickly.
I'm surprised BF4 even has a 32 bit version at this point honestly, but whatever works.
The current BF4 thread covers consoles and Windows, and both bitnesses; I created this thread to focus specifically on the Windows x64 version, and for the reason you just stated - more and more games are going to follow suit (Watch Dogs, for example, will be x64-only).
Also, BF4 x64 has lower requirements (in terms of RAM or GPU) than Watch Dogs, and is a different genre altogether than Watch Dogs. (I admit; I'll be very curious to see how Watch Dogs turns out, though.)
The biggest reason for the thread is to cover the state of the x64 game, and especially in terms of Windows, today, and how it got to the excellent state of the art as represented by BF4, from the horrible state it was in with the original Crysis.