Pre-purchases are now underway for NBA 2K15 on Steam, offering a Kevin Durant MVP bonus pack as an incentive. The page now offers system requirements for the Windows edition of the sports simulation (thanks DSOGaming). Here's word:

Minimum:
OS: Windows 7 64 bit or higher
Processor: Intel Core2 Duo or better
Memory: 2 or more GB RAM
Graphics: DirectX 10.1 compatible (512 MB) or better
DirectX: Version 11
Hard Drive: 50 or more GB available space
Sound Card: 9.0c compatible
Additional Notes: Keyboard or dual-analog gamepad

Recommended:
OS: Windows 7 64 bit or higher
Processor: Intel Core i7 or better
Memory: 4 or more GB RAM
Graphics: DirectX 11.0 compatible (2 GB) or better
DirectX: Version 11
Hard Drive: 50 or more GB available space
Sound Card: DirectX 9.0c compatible
Additional Notes: Dual-analog gamepad