Darkzero writes: "We know that some people are planning to import GTA IV due to the game been edited in some parts of the world. However, if you are one of those people planning on doing so we'd advise you not to import the PAL version 360 release of the game as it as been confirmed it is not region free. So, if you happen to have it pre-ordered somewhere we advise run and cancel that right now.
Please note the US version of the game could be different, as a few games released in the US have been region free while the Euro one was locked. However, no details on that version have been made known as of yet."