My take on the next few releases, for what it's worth;
SF2: Tomcat - From everything TK's said, I think this going to be GIUK or North Cape scenarios, like Microprose F-14 Fleet Defender back in the day. The F-14A will replace the F-4J on the USN's decks and he gets to re-use the A6 & A-7 (maybe with an A-6 cockpit). NATO planes could be re-used from SF2:E and he can add skins for Norwegian F-104s ( and maybe F-16s too). For the opposition maybe we will see a MiG 25, Bear and\or Backfire and some Sov warships (including Kiev and possibly a Yak 38 too?). It may well be easier for him to do Iran\Iraq (he has most of the other aircraft already available, except the F-5, so would only need skins and a terrain) but I don't see it happening. I wouldn't put it past him to include an Iranian skin for the F-14 as a teaser or to spur a 2nd Gen remake of this scenario though.
I think after that we may see a return to SF2:E, with TK dialing it back to the 1940s\50s - he said as much when he said that he made the Spitfires for SF2:I with an eye on putting up some opposition for the P-51 over Europe in a merged install. So say he goes for a Berlin Airlift gone hot scenario we could see some USAF\NATO fighters from that era, like the F-80 and F-86, bombers like the B-29, and some more allied transport types, possibly a C-46 or more likely a C-54. The red side would get some prop Yaks or MiGs, maybe an early transport type and possibly an Il-10 to support the Red Army's thrust in western Europe.
So, after a new game (SF2: Tomcat) and an expansion pack (SF2:E - Berlin Crisis), we may then see another new game - SF2: Korea, because by then then TK will have far fewer new planes to add, such as the Sea Fury, F4U and F9F for the UN and the La-9 for NK, and can concentrate on a new terrain and skins for the Koerean era planes. And in time an expansion pack for this one could give us a 1980s Korean War II scenario with F-4s, F-16s etc against MiGs, Sukhois etc.
Of course I'm probably totally wrong!