I think I recall seeing Pyro or HiTech post that there will be no new development of Aces High so they could concentrate on developing Aces High 2. So I don't think we'll be seeing any new stuff other than maybe some patches that fix some problems.
Besides, this free promotion that HiTech is doing is only going to last for a couple of more weeks and then the hordes will be gone and you'll be whining about all the little lambs that you can't shoot down anymore.
ack-ack