Flitze,
Here are my opinions on the aircraft you listed:
B-24: This is functionally a B-17 in different clothes. Its stats are slightly different, but the roll is the same. With the number of American units already in AH, and the amount of work a 4 engined aircraft requires, I think the B-24 should be very low on HTC's priority list.
B-25: This fills the same roll as the B-26, as well as having ground attack versions. Once again it is an American aircraft and we have enough for awhile. I think the B-25 should be added much sooner that the B-24, however.
Ju188 (some variants may be perked): There are many German aircraft already in AH, but I agree that the Germans need more bombers. I do not think that any German bomber, other than the Ar234, should be perked. I would rather see the He177 as the next German bomber, but the Ju188 is a good aircraft as well. I think that a new German bomber should be a low priority.
PBY Catalina: Yet another American aircraft, and my current opinion of adding more of those has already been stated. I would very much like the first flying boat to be the Kawanishi H8K2 "Emily". Not only is the "Emily" a better flying boat, but it would fill many need rolls for both the Japanese and Axis. It gives the Japanese a tough, well defended four engined bomber and torpedo aircraft. With slight modification to the H8K3 it adds troop carrying capability, although the H8K3 would need to be perked. I would kind of like to see the H8K2 and PBY Catalina added at the same time. The H8K2 is one of my top 3 choices for new aircraft to be added.
Mosquito (ok, maybe perked or not): Yes, we need the Mosquito. I would like to see Mosquito FB.MkVI, Mosquito B.MkXVI, Mosquito FB.MkXVIII and, if night fighters are added, the Mosquito NF.30. The Mosquito B.MkXVI and Mosquito NF.30 may need to be perks. The Mosquito is the third part of the 3 core aircraft of the WWII RAF in the popular mind, Spitfire, Mosquito and Lancaster. I think that the Mosquito should be a high priority for HTC.
many ordinary Japanese fighters and bombers: I agree. There are too many to mention, but I think this should be HTC's highest priority.
Il-2: I think, not positive, that we will see this one in v1.07. This is my 5th most desired aircraft for AH. I think this should be a high priority, but I also think that NATEDOG is working on it right now.

some Russian bombers: Once again, I agree. I would like to se the Tu-2 more that the Pe-2, but they both need to be added at some point. I think this should be a high priority for HTC.
The reason I responded is that you mentioned the Spitfire F.21, and I believe that you mentioned it because of one of my posts. I am not actually very keen on getting the Spitfire F.21, I only mention it because the Luftwaffe fans are so keen on requesting a never ending stream of German aircraft that simply HAVE to be in the next version. I use the Spit 21 as a reference to the fact that they already have the German equivalent in the Ta152H-1. I do want the British equivalent to the Fw190D-9, the Spitfire MkXIV, but that entered service in Jan. 1944, more than a year before the Spitfire 21.
I would like to see the late war plane set finished, or at least mostly finished before moving to early war aircraft. Why? Because only the Germans and Americans have their late war plane set anywhere near finished. I would like to see the Japanese, Russian and British (I'm afraid there is no real hope for the Italians) get their late war aircraft as well.
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We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother
Bring the Spitfire F.MkXIVc to Aces High!!!Sisu
-Karnak