We've finally heard some news about Grand Theft Auto 4's place on the Steam Store today, but I'm afraid to say it's decidedly mixed, as Rockstar has announced it will return at the cost of multiplayer on PC platforms.
Why on earth is this happening? Last month Grand Theft Auto 4 was delisted on Steam thanks to its reliance on the Games for Windows Live platform. Rockstar explained to USgamer it was unable to "generate the additional keys needed to continue selling the current version of the game", as Microsoft had officially ended support for Games for Windows Live.
To solve the problem, Rockstar has now decided it will replace all versions of Grand Theft Auto 4 and Grand Theft Auto: Episodes from Liberty City with Grand Theft Auto 4: Complete Edition "wherever it is currently digitally available", including Steam and the Rockstar Games Launcher. As a result of the problems with Games for Windows Live, multiplayer mode and leaderboards will no longer be available in Grand Theft Auto 4: Complete Edition. Sounds a bit incomplete to me, really, but here we are.