We saw the first Grand Theft Auto V trailer recreated in the original San Andreas (GTA: San Andreas, to be exact). Then someone set it in Grand Theft Auto IV. So, with the second trailer's release earlier this week, it's natural we get that one rebuilt inside IV as well.
This is by YouTube user underage117. If you want to compare it to the original, it's embedded below. Or watch them side-by-side here (might want to mute the volume on one.) My suspicion is that this won't stop until Grand Theft Auto V is recreated in Grand Theft Auto IV, which will be a hell of a trick considering its map is, at most, about 1/7th the size of what GTA V's is said to be.
GTA V Trailer #2 remade in GTA IV uploaded by underage117 [YouTube — h/t Adriaan V]