http://aceybongos.spaces.live.com/blog/cns!34EFB79E92974FD2!16380.entry?sa=454920763
http://www.computerandvideogames.com/article.php?id=205826
Looks like MS is using scare tactics to get people to delete the DLC.
By saying that it can corrupt your save, etc etc. While others are saying that it isn't in testing stage and that it is all there and working.
Apparently the music in the DLC is ingame now, along with some racers or something.
"I managed to grab it early this morning and played around with it. It certainly isn't being tested, it's done and complete. The racers are in the area, the new music is in the game (Deadm5au!), but I haven't found the new cars or achievements yet, although I didn't look. I did grab some screenshots though that you can find below on rockstar social club.
E3 Conference Center:
http://socialclub.rockstargames.com/RockstarWebServices/mcla/common/getsakeimage.ashx?pid=923538&fileid=63485121
City Scape:
http://socialclub.rockstargames.com/RockstarWebServices/mcla/common/getsakeimage.ashx?pid=923538&fileid=63485117
Awesome view of area around Staples Center (which E3 building is next too):
http://socialclub.rockstargames.com/RockstarWebServices/mcla/common/getsakeimage.ashx?pid=923538&fileid=63485435 "