Dragon Age 2 - PC System Requirements

Bioware has updated the FAQ for this game with the PC system requirements. Chris Priestly mentions them in this thread. You can also read them below:

Recommended:
    CPU: Intel Core 2 Quad 2.4 GHz Processor or equivalent
    CPU: AMD Phenom II X3 Triple core 2.8 GHz or equivalent
    RAM: 2GB (4 GB Vista and Windows 7)
    Video: ATI 3850 512 MB or greater
    Video: NVIDIA 8800GTS 512 MB or greater
    DirectX 11: ATI 5850 or greater
    DirectX 11: NVIDIA 460 or greater

Minimum:
    OS: Windows XP with SP3
    OS: Windows Vista with SP2
    OS: Windows 7
    CPU: Intel Core 2 Duo (or equivalent) running at 1.8 GHz or greater
    CPU: AMD Athlon 64 X2 (or equivalent) running at 1.8 GHz or greater
    RAM: 1 GB (1.5 GB Vista and Windows 7)
    Video: Radeon HD 2600 Pro 256 MB
    Video: NVIDIA GeForce 7900 GS 256 MB cards
    Disc Drive: DVD ROM drive required
    Hard Drive: 7 GB
    Sound: Direct X 9.0c Compatible Sound Card Windows Experience Index: 4.5

Dragon Age 2 will support DX 11, Priestly states.