You may find this extract from KC23's interview with Rowan interesting.
[ KC23 ] Judging by the response of the various flight sim newsgroups and forums MiG Alley seems to be extremely popular. Were you surprised by the overwhelmingly positive response and do you think that might have an impact on any decision for an add-on for MiG Alley in the immediate future? [ Mark Shaw ] I would certainly like to do an add-on. If not a full add-on then maybe a few more quick missions. It's all boils down to time and money. If the game is a success (worldwide) then it is a possibility. The decision ultimately lies with Rod and Empire.
[ KC23 ] Hypothetically if the decision was made to go ahead with an add-on which new aircraft(s) would you personably be most interested in seeing? What other interesting things might we see in a possible add-on?
[ Mark Shaw ] Some of the navy aircraft would be nice (panther, corsair), but adding a carrier and the ai to accompany it would be like starting a new project! It would be interesting (not to mention a great test of your pilot skill) to fly the meteor, the token british aircraft.
[ Rod Hyde ] Adding the Navy's input would be interesting. I would like to simulate 1950's carrier activity. That though, as Mark says, is like a new project. I suppose It could be a mission disk. Anything we do, needs to add a new angle and not be more of the same. So adding some more quick missions that explore new areas is a good idea. Any ideas are welcome!
As far as aircraft are concerned I would like to fly the F82.
[ Frugal (so you don't confuse this with part of the interview) ]
So you never know, the trick is to convince everyone you know to go out and buy Mig Alley. That way it will be a resounding success and they'll be able to justify the mission disk and Carrier ops 
BTW you can read the full interview at:
http://www.frugalsworld.com/rowan.html
Frugal
------------------
Mark "Frugal" Bush
Falcon 4 Instuctor Pilot
Managing Editor:
Frugal's World of Simulations