Check out Comic Book Resources interview with X-men's current writer , Mike Carey (or just see below). They answered my question about Alpha's mutants.
"We'll start off with an easy one, Mike. Ahab Johanssen just wanted to know about a few of his favorite characters. “Now that Aurora and Northstar have been restored, will they be showing up in the X-Universe again soon? How about other Alpha-related characters such as Madison Jeffries and Diamond Lil?”
Ahab, stay tuned. There'll be some really cool Beaubier-related news breaking soon – maybe at the San Diego Comic-Con. I don't know of anything planned with Jeffries or Lil. Basically, with Northstar and Aurora, we always planned after the annual to bring them back into the fold and add them to a team roster. Then...well, I think you'll be excited when you hear what's coming up for the twins."
Makes you wonder if the "Then" has anything to do with the success of Omega Flight...we can only hope!