Nas is on the new Swizz Beatz album that is coming out this summer
also:
Swizz told Pitchfork that the Nas feature on Poison was originally recorded for an as-yet-unreleased Nas full-length the two made together. “I did his album two years ago in one week in L.A.,” he said. “In the studio every day at 12 o’clock, just bang bang bang. Recorded the whole thing, got it all on film. It was an ill process.” Swizz described the Nas tracks as “super crazy, maniac shyt.”
Swizz Beatz Talks New Album Featuring Kendrick, Nas, Lil Wayne, Pusha T, More | Pitchfork
So it makes sense now. Nas recorded full length albums worth of material with different producers. So he did one with Timbaland (Nas kind of confirmed this in 2014), one with Swizz, and possibly one with No ID. We know he did one with Kanye and it is the only one to see the light of day so far.