The CAPCOM Blog has word that preorders are now underway for the Windows PC edition of Resident Evil: Operation Raccoon City. The PC version of the survival/horror shooter is on track for its previously announced May 18th release, and include an explanation that it will not contain additional content. They also offer system specs:

Minimum:

OS: Windows Vista(R)/XP, Windows 7
Processor: Intel(R) Core(TM)2 Duo 2.4 Ghz or better, AMD Athlon(TM) X2 2.8 Ghz or better
Memory: 2 GB RAM
Hard Disk Space: 8 GB free hard drive space
Video Card: NVIDIA(R) GeForce(R) 8800GTS or better, ATI Radeon(TM) HD 3850 or better
DirectX®: 9.0c or greater
Sound: Standard audio device
Other Requirements: Online play requires software installation of and log-in to Games For Windows - LIVE

Recommended:

OS: Windows Vista(R)/XP, Windows 7
Processor: Intel(R) Core(TM)2 Quad 2.7 Ghz or better, AMD Phenom(TM)II X4 3 Ghz or better
Memory: 4 GB RAM
Hard Disk Space: 8 GB free hard drive space
Video Card: NVIDIA(R) GeForce(R) GTX 560 or better