Well, Chewie and C-3PO (2.0 Hardcore Edition) are there....but yeah, no Lando, Luke, or even Leia.
Anyway, this poster is almost certainly legit. I thought so from the moment I saw it, because it has far too many original costumes and new poses to be fake. I'm pretty sure it's not a theatrical poster, though.
One little detail I'm interested in is that there seems to be some kind of leather strap on the Anakin/Luke/Rey lightsaber--I wonder if it's a permanent part of the repairs or if it's just a new accessory?
Also, one of the Knights of Ren has a meat cleaver, and another literally has a cannon for an arm...