1) Remodel the Ju-88; currently the oldest 3D model in the game, and not a bad bomber all things considered. Offers a good chance to add new models of the plane, as well as the Ju-188, which is something that would be both a solid MA bomber, as well as special events aircraft.
Perhaps we'll see a Ju-88P in particular.
2) Change the layout of the guns at port: Lets be honest, the layout is rather aggressively poor, bordering on actively terrible depending on which gun in particular you're trying to use. IIRC, the '88s are incapable of firing on low-medium altitude targets (such as a fair number of bombers, and many CV planes) inbound from the seaward side of base.
What I would like to see is the the two existing '88s placed more out in the open, where they have a good field of fire towards the land-side of the base. Add another pair at the end of the docks so that they have a good field of fire out to sea.
Additional benefits would be making it harder to take (even if only minimally), since the only two hangers are adjacent to one another, and you can take out half the ack along with hitting the hangers on a single bomb run.