I don't know anything about current console software/os, but couldn't this be in preparation for the new consoles this year and them being, I assume, 64 bit based ?
All Dice's games are cross-platform now.
It has more to do with memory limitations. 32-bit operating systems can only utilize a maximum of ~3.5GB of RAM. Most (all?) PC games ever released are 32-bit, and thus can't access anymore memory than the 32-bit OS it's installed on.
Now imagine games written natively for 64-bit systems, where that memory limitation is removed. The whopping 8GB of RAM in modern gaming PCs can really be put to work. That means being able to load much more content; huge levels, huge maps, etc, etc. (Just so you know: 64-bit Windows 7 Ultimate can support up to
192GB of memory. That's an order of magnitude more RAM!)
Of course, consoles have never had more than a single gigabyte of memory, so the whole 32bit/64bit thing has been irrelevant for them. The PS4 is going to change that though, with it's 8GB of RAM.
Combine that with the PS4's x86-64 CPU architecture, and the thing's basically a gaming PC... completely unlike the PS3, which had the notoriously complicated, proprietary Cell processor.
Having a console with similar specs to a PC is wonderful, and benefits both PC gamers and console gamers alike:
-Easier to port games from one system to another
-Higher quality PC ports
-Higher quality PS4 games, since it's an environment programmers are already used to
-Lots of memory available on both systems
It's a win for everyone.
And I know I've strayed off-topic here... but yes, it's a good thing DICE is going 64-bit only. I don't know a single gamer who still uses a 32-bit operating system.