Looks like they are forming a Justice League of rappers, vs the evil 50 Cent and cronies, lol.

Seriously tho, 50 had better not slip up. His slight disapproval of Jigga that he hints at in all those interviews, i know both Nas and Jay-Z are just waiting for one diss to be half a centimeter above the subliminal level and they will probably do a whole duet album snapping on g-unit.