X-23 will be making an appearance in Avengers Academy issue 23. Gotta love that. X-23 in issue 23. I hope this becomes a reoccurring trend. It's just too perfect.
Anyway, the cover can be found on Marvel's site.
Quoted from Christos Gage, writer of Avengers Academy, taken from a Marvel interview with him about upcoming Avengers Academy stories where Marvel.com asked "Now on the cover to issue #23, we have Mettle flinging X-23 into the reader’s lap. How does Laura end up in AVENGERS ACADEMY?"
There’ll be a more extensive explanation in issue #23, but suffice it to say both the Avengers Academy faculty and the X-Men felt it would be beneficial. Laura has “baggage” with some of the X-Men kids she doesn’t have here. And she has struggled with some similar issues to cast members from AVENGERS ACADEMY, including wrestling with being a killer. So they’re hoping it will benefit all concerned. Of course, there are risks, too.