Some stunning line work from Sook for issue 6 of Legion
https://www.instagram.com/p/B9jimtsplEC/
Also, Bendis says "Coming soon in Legion of superheroes issue six pencil art by the incomparable @rsookart #legionofsuperheroes #longlivethelegion spent most of yesterday putting together what might be one of the most stunning #legionofsuperheroes projects ever. Details to come! #addictedtojamprojects"
It's the last bit in bold that really interest me. Bendis seems to be hinting at a collaborative Legion special coming up that's in the same mold as the Superman: Heroes and Villains specials we've had. Makes sense that he'd tag the post with "addicted to jam projects". This also lines up with a tweet he sent out around when issue 1 or 2 of Legion came out saying that he's working on getting together something akin to a classic who's who for the Legion. Could be the same project?
Similar to how it worked in Superman, it would keep space free in the main book for him to continue of uninterrupted, but it would also allow for all of the small interactions and some of the answered questions and further world building.
As far as books that would only be helped by accompanying specials, Legion as a concept is always at the top of the list. Wonder if it's gonna be all him on writing, or if he'll get Fraction and maybe some Wonder Comics collaborators in on this?