Let's pick up from after the preview ends.
A bunch of bigots are talking about how muties should just get screwed and Erik tries to discuss with them but is reviled as a mutie lover, until young Kate interferes and talks about him being a Holocaust survivor. Which makes the rednecks even more suspicious since he looks, y'know, quite good despite his supposed age. Anyway, he exits the diner and is about to kill them until Kate comes to talk to him and he gives up on it.
Flashback to the previous day, where Erik is in a danger room session fighting the X-Men without safety protocols engaged and he gets hurt, prompting Nanny to stop the simulation. Briar tells him about the detention camps and Erik decides to deal with it despite being hurt. Flashforward to current day and he attacks the place, almost being taken out by a O.N.E. sentinel. When he takes the robot apart, he sees it's piloted by a girl who reminds him of Kate, Kitty Pryde and his deceased daughter. He proceeds to try and convince the kids in the camp to go with him and they answer they should stay and fight for their ideals, since the USA was founded on such principles. Erik isn't having that and lifts the whole thing into Asteroid M. The O.N.E. agents discuss how they almost took him out and next time they'll be ready for him. Issue ends with a little drawing Erik sends Kate of them both being BFFs in space (I'm actually not totally sure if it's an adult Kate or her mom, but the latter seems unlikely)
The Apocalypse story is about him trying to hitch a new body, with a bunch of previous subjects already dead, but his machine overloads and sends him to what's either another dimension or planet. He fights and kills a weird alien and realizes, to his dismay, that his powers are vanishing and he's becoming a flatscan.
REVIEW: Forgive me if I was too brief. Just tried to put the essentials here and not make the OP bothersome to read through. Claremont's part was quite good, despite the kids talking to Erik being a little heavy handed. The art's not that good, but not really a problem for the most part. Erik's well written and his moments with Kate are pretty sweet, particularly the end with the drawing he sent to her. The part with the O.N.E. soldiers is naturally to tease a future conflict between them and Magneto and the pilot girl seems quite eager to kill Erik. Humans, amirite?! Anyway, I liked this, even if Claremont hasn't been my cup of tea for years.
The Apocalypse story is OK as a starting point. I'm curious to see how Apoc will get out of this pickle. He's written well enough here, as he looks quite anxious to get his new body and now truly desperate with his new reality. Borges' art is pretty good.
Overall, X-Men Black started well enough. Let's wait and see what future issues hold.