With the one-two punch of AMD64 processors and “Shadow Ops: Red Mercury,” gamers will notice larger and more detailed areas to explore, breakthrough artificial intelligence (AI), and never-before-seen textures that compel players to gawk in amazement.There's no word on whether the game runs faster on 64-bit systems or whether environments are just more detailed. Definitively attributing performance benefits to 64-bitness would be difficult on a beta version of XP-64 with beta drivers, anyway.
If you're curious about the game, FileShack has a single player Red Mercury demo available. I suspect that the demo is 32-bit only, but it appears that retail copies of the game come with both 32- and 64-bit binaries.
AMD is also working with developers on 64-bit flavors of Far Cry and S.T.A.L.K.E.R: Shadows of Chernobyl. Let's hope AMD doesn't start branding games with The Way It's Meant To Be Played-esque logos.