According to the UK gamespy website, the FOC "conversion" to PC will go the full nine yards with multiplayer as well as the regular game.

Mercenary is building Transformers: Fall of Cybertron with Steamworks support for multiplayer -- matchmaking, achievements, community features, the whole nine. Livergood [J.D. Livergood, Activision Associate Producer] also promises enhanced textures, lighting, and shadows to help make the Unreal Engine 3-powered game a visual stunner on PC
Also from the article, which I want to confirm from Activision in Australia:

In what appears to be a first for Activision, Fall of Cybertron will be a digital exclusive in the US, though there will be a retail version overseas. A sign of things to come?

Activision won't be attaching any additional DRM to Fall of Cybertron.

There will not be a map editor or mod tools of any kind.

The PC version will launch alongside its console counterparts on August 21. Livergood added that all Transformers: Fall of Cybertron DLC will also be released simultaneously across all platforms.