Nas need to drop that solo album before he does a joint project...
And honestly I doubt they’d do an entire album. MAYBE an EP, and that’s stretching it.
If you look at both of their Collab history Nas has done Distant Relatives, which had specific theme, and Jay has done WTT, which was with a producer he’d known and done music with for over 12 years. Joint albums need a certain CHEMISTRY to work. They’d have to spend hours in the studio together, coming up with concepts, beats, and a theme that BOTH could rock with. I know they are friends now, but they are both two VERRRYYYY different artists.
The more likely avenue would be a world tour together. That would be dope as fukk