Bit of a turn up for the books. A followup to RO is going to be distributed via steam, bit of info here
http://www.redorchestragame.com/
The original Red Orchestra won Nvidia's "$1,000,000 Make Something Unreal" contest. Red Orchestra: Ostfront 41-45 is a standalone follow-up, built on Epic’s Unreal EngineTM 2.5, that introduces new gameplay and features.