According to PSU Sources Sony are ready to take Rockstar “under their wings”.

"We were coming from a joint Sony, Activision event there in Southern California, when we were told something we definitely weren't ready for

The discussion at Tengu was fairly simple in its scope: various sources in the press and development team state that Sony is looking to take Rockstar “under their wings”. While we learned that any agreement Sony and Take Two entered into would not affect the upcoming Grand Theft Auto IV, such an agreement would presumably affect any future releases from Rockstar, including the new franchise Sony has been discussing and L.A. Noire, which looks likely to be a PS3 exclusive at this point as well."