A recent tweet by DICE developer Johan Andersson claims that the upcoming Battlefield 3 FPS Game will be based on DICE's latest Frostbite 2.0 which is primarily a DX 11 Engine and also that it won't support DirectX9 which is a bad news for XP users. Here's the tweet:
A tweet by DICE developer Johan Andersson:
Frostbite 2 is primarily developed for DX11. XP & DX9 is _not_ supported, 64-bit OS is recommended. Lots of time to upgrade if you havent!
There's still alot of time left in the release of the game so users with windows XP and DirectX9 Graphics cards need to upgrade to a better platform. The news doesn't confirms if the game will support DirectX 10 but it most probably will. According to a Survey on Steam, Most of the PC games have switched to Windows7 and a DX10/11 GPU and the trend if remains like this then upto 50-75% will have updated rigs by the end of 2011.