Games for Windows update coming with GTAIV

[BenKenobi88]

salaminizer said:

if it meant that the game would feature cross-platform multiplayer, there wouldn't be any problem.

but anyway, Dawn of War II will be GFW and it's coming to steam, so GTAIV should come too (can't buy it over Steam though).

I don't even know what the marketplace offers right now, but achievements & stuff don't attract me if they don't reflect ingame.

Wait, Dawn of War II will be GFW and also on Steam?  Then why wouldn't GTA4 be available on Steam?  All the previous GTA games and Rockstar's library is available on Steam already...