What will the next airframe to be updated to AH2 standards be? It seems to me that all of the units thus far updated, other than the recent F4Us, have been CT oriented. That does leave out some of those that need the update most, such as the F6F-5, La-5FN/La-7 and N1K2-J, but there are some others that are appropriate for CT and waiting for their updates.
In alphabetic order:
A-20G/Boston Mk III: The A-20G saw service in nearly every place we fought in WWII. As such it would be a widely useful aircraft to update. The Boston Mk III isn't as usefull, but it is useful as an early war Allied bomber, if annoyingly fast.
B-26B Marauder: This is one of the original AH v1.0 aircraft and as such is one of the longest in the tooth so to speak. The B-26B also saw heavy service in Europe at the time of CT and is an American bomber, which fits the USAAF vs Luftwaffe setting very well.
Bf110C-4b and Bf110G-2: Bf110s were employed against American bombers in the timeframe that CT will be set in and would add a nice heavy fighter to the Luftwaffe's order of battle, even if, as one P-47 pilot put it, it is "meat on the table". This would also be a golden oportunity to replace the Bf110C-4b with a straight up Bf110C-4 so that we have a version appropriate to the Battle of Britain, not some "less than 25 built" early war wonder version.
C-47A: Another of the AH v1.0 units in need of updating and it also saw heavy American use in the European theater at the time CT is going to be set.
Ju88A-4: The first German bomber to be added to AH and one that saw service in many roles throughout the European war. Updating the Ju88A-4 would be good for Battle of Britain settings and offer the chance to add a Ju88C-4b or Ju88G-7b for use as a fighter in later periods.
Mosquito Mk VI: The Mossie 6 saw very heavy use from mid 1943 until the end of WWII. Updating this aircraft would off the oportunity to fix the bugs with it as well as adding other versions of this versatile aircraft such as the B.Mk IV for earlier use and the B.Mk XVI/PR.Mk XVI for later use. If PR missions are included in CT then the PR.Mk XVI would be useful as the USAAF employed it to track the weather and take before and after pictures of the targets hit by the 17s and 24s. Due to its speed it would take the before and after pictures on the same flight and the after pictures would be ready and waiting for the debrief once the big bombers got home.
Typhoon Mk Ib: One of the older aircraft in AH, but used only by the RAF. If the RAF will have a place in the initial version of CT, then a bit useful, other than that, not so much.
Long Shots:
A6M2/A6M5b Zero: Still looks relatively decent and is limited to Pacific Theater settings.
F6F-5 Hellcat: Needs an update badly, but it is almost completely limited to the Pacific Theater of operations.
La-5FN/La-7: Also in need of an update, but limited to the East Front in use.
Lancaster Mk III: Still looks reasonably decent even if new skins are practically impossible for it. Mainly used by the RAF for night missions, so not too much use in CT and as a heavy bomber it presents a massive amount of work to update.
N1K2-J Shiden-Kai: One of the AH v1.0 aircraft and in desparate need of a facelift, but limited to late war Pacific Theater settings.