Rockstar has released patch number five for the PC version of Grand Theft Auto IV. Here is a list of changes brought by the patch.

GENERAL:
Convert all region SKU's into the same SKU.
Include support for all languages within single exe.

CONTROLS:
Allow controls to be double mapped on keyboard.
Added option in controls menu to disable mouse controls in helicopters.
Adjust keyboard control sensitivity in hood cam view in vehicles.

MULTIPLAYER:
Security Updates to deter cheating in multiplayer.
Hosts can now immediately Kick users from their games in Lobby and in game via Cell phone without having to rely on peer voting.
Fixed a bug in Cops 'n Crooks mode where Host would drop out and prevent remaining players from leaving game.

The most interesting thing about the patch however is the fact that it makes the game list the five achievements from The Lost and Damned. This isn't a fluke on Microsoft's side either as if you go to the page for GTAIV PC, only the original achievements are listed. It's only in game that it reports the new ones. With this combined with the fact that TLAD bikes have been in the files of the PC version of GTAIV since release, we're going to go out on a limb and say that we should hear an announcement real soon regarding TLAD riding it's way to the PC.