This article contains spoilers for "Extraordinary X-Men" #2.
After a number of questions were raised in its debut issue, "Extraordinary X-Men" #2 answers one of the big ones by revealing the location of X-Haven. The first issue of writer Jeff Lemire and artist Humberto Ramos' run depicted Storm and her small team of X-Men loading up students to depart for X-Haven, a safe space away from the lethal Terrigen Mists; the issue concluded without revealing the hideout's location. Issue #2 cleared things up a bit.
With Magik and Colossus away on a mission to recruit Nightcrawler, Iceman, Storm, Forge and the rest of the gathered mutants regroup in X-Haven. But things quickly fall apart when the Rasputin siblings enter the New York City sewers in search of the missing Nightcrawler. They run afoul of Mr. Sinister and a few of his henchmen, who knock Magik unconscious and therefore weaken the defenses she put up around X-Haven -- which is revealed to be located within Limbo.
X-POSITION: Jeff Lemire Teases Inhumans and Interconnectivity in "Extraordinary X-Men"
Limbo is a magical, demon-filled dimension that obeys its own laws of time and space. Magik was originally lost in the dimension as a young child and re-emerged in the main Marvel reality seconds later as a teenager, having spent an entire childhood in the hellish dimension in the blink of an eye. Magik's mutant teleportation power is connected to the dimension, as she steps through it every time she opens a stepping disk from one location to another.
The location of X-Haven wasn't the only big reveal in "Extraordinary" #2. In the issue, Storm mentions a few times that the adult Cyclops has died. The nature of his death has not yet been revealed, and the first issue of the series remained vague about what happened to the X-Men's former leader.
"Extraordinary X-Men" #2 by Jeff Lemire and Humberto Ramos is in stores now.