I'd like to see a few more aircraft model updates (cockpits, airframes and FM tweaks (if necessary)).
On my list would be:
1- Yak 9 U/T (One of my favourite aircraft... so I'm a little biased here)
2- F6F 5 (This has to be one of the more popular aircraft due to CV capability... it could do with a face lift)
3- Ju 88 (Update the cockpit/airframe and also add a few variants... The C model heavy fighter for example)