Tying into Airtight's Dark Void, the supposed 'lost project' was originally released on DSiWare in January. New features for the PC and iPhone editions include online leaderboards tracking scores and speed runs, as well as an exclusive "secret ending."
The PC version boasts Steam achievements while iPhone achievements are offered through OpenFeint, which also means players can spam Facebook with their progress.
The Steam achievements make it highly likely that the PC release will be exclusive to Valve Software's digital distribution platform. Pricing has yet to be revealed, though for reference Dark Void Zero cost $5 on DSi.