There's a lot to be excited about if you are a fan of early 90's X-Men, a revival of the animated series, a new X-Men 92' comic and a few 90's X-Men Legends arcs from Hama & Nicieza.
I'm not personally a huge fan of that era, Jim Lee's art and costume designs don't do anything for me and I was born in the middle of the TAS initial release run so I don't have any real love from watching the show as a kid. But instead of spending time bashing Marvel's current interest in early 90's nostalgia, I wondered what other era's people would be excited to put on their nosalgia glasses and re-visit in the form of limited series/ X-Men Legends stories.
I read a lot of New Mutants original volume as a kid and long for an X-Men Legends arc or two focusing on the late Claremont period of the book when Magneto was running the school. Or maybe another fun one-shot like War Children from a couple of years back.
I'm also a massive Rachel Summers fan so would love it if Marvel ever decided to release something to fill in the gap the aborted Phoenix mini series would have by covering her time in Mojoworld in between Wolverine stabbing her and Excalibur. Not sure if it would ever make financial sense for Mavrel, but i'd love to see it.