Supergiant Games now offers preorders of Transistor for PC and PS4, also announcing the soundtrack will be released alongside the sci-fi themed action/RPG on May 20th (thanks nin via Joystiq). They have updated the Transistor FAQ and also announce a few PC-specific features along with system specifications:

Transistor for PC Features
- Full controller support & fully remappable controls
- Steamworks support including cloud saves, achievements, & trading cards
- DRM-free: You can play the game offline if you want

PC Minimum System Requirements
OS: Windows 7 or newer
CPU: 2.6GHz Dual Core CPU or greater
RAM: 4GB or greater
GPU: 1GB Video RAM or greater, e.g. Intel HD Graphics 3000, Nvidia 9400 GT, AMD HD 5450
Hard Drive Space: 4GB free