Although it hasn't yet been officially confirmed, the upcoming X-wedding is expected to be Northstar getting hitched to his boyfriend. But the following shipping update (thanks to Newsarama) suggest that it might be quite a bit more than that..
ASTONISHING X-MEN #51 will have everyone inside and outside of the industry talking. Marvel has secured mainstream coverage both on-air and in print, for something that has never been seen inside the pages of a Marvel comic. Not only that, but some retailers are already saving the date and are hosting special wedding events in their stores.
Retailers who exceed 300% of their orders of ASTONISHING X-MEN #49 with their orders by FOC for ASTONISHING X-MEN #51 can order as many copies as they wish of the ASTONISHING X-MEN 51 CREATE YOUR OWN WEDDING VARIANT. Note: details on this variant will be revealed in the coming weeks and is NOT similar to the customized Comic Shop Variants, most recently offered on Spider-Men #1.
Certainly seems as if Marvel intend to make quite a big deal of this upcoming wedding. Now assuming it is Northstar and his fella tying the knot, a same sex marriage is technically something that we haven't seen in a Marvel comic (although
Archie did beat them to it!), but this sounds like it won't just be the nuptials that people will be talking about. More info as we have it.