First, we'll apparently learn next issue the identity of the person who made the bomb and why s/he provided it to the humans. Sabretooth comments here that Dark Beast and Essex are the only people capable of making it, though I'd put my money on Dr. Nemesis at this point. We learn in this issue that he's been running his own lab within Dark Beast's lab and that he has a grudge against the Four Horsemen for not giving him more support for his work. In other words, he had the capability and the motive.
In terms of this issue, though, it feels like we're mostly spinning our wheels. Nicieza uses the age-old cheat of delivering plot points through telepathy: Nemesis does something to Jean Grey (it's not clear what he does), and she unleashes a psychic blast that somehow connects her to Emma telepathically. It conveniently allows the X-Men to become aware of the bomb's existence just as the Horsemen learn of it from torturing Carol Danvers. It sets off the scramble to recover it that we see at the end, with Apocalypse finally detonating the bomb.
I'll admit that I'm intrigued to see who survives the blast, showing that I don't really have too many problems with the plot of this series. But, as a I mentioned last issue, the delivery still leaves me wanting for more information about the characters, their motivations, and their relationships with each other. Right now, it still feels like a jumble, and we don't have a lot of time left for the pieces to fall nicely into place.
** (two of five stars)