I posted this in the CT Forum, but it'll get more traffic here:
Ki-44-IIb Shoki "Tojo":
Engine: one Nakajima Ha-109 at 1,520hp.
Speed: 378 mph
Ceiling: 36,745 ft
Initial Climb: 3,828 fpm
Range: 1,050 miles.
Armament: two 12.7mm Ho-103 machine guns above the engine and two more in the wings.
Ordanance: two 100kg bombs.
Number Built: 1,233 of all versions. The Ki-44-IIb was the major version.
The Ki-44-IIb would give the Japanese a fast climbing interceptor with good speed and acceptable armament. This fighter could be used in the CT with no restrictions other than launching from land bases.
Ki-84-Ia Hayate "Frank"
Engine: one Nakajima Ha-45 at 1,900hp.
Speed: 392 mph
Ceiling: 36,090 ft
Initail Climb: 3,600 fpm
Range: 1,347 miles.
Armament: two 12.7mm Ho-103 machine guns above engine and two 20mm Ho-5 cannon in wings.
Ordanance: two 250kg bombs.
Number Built: 3,514 of all versions. The Ki-84-Ia was the major version.
The Ki-84-Ia would give the Japanese a fighter that, unlike the N1K2-J, saw widespread use and can challenge the best American and British fighters. Due to its production total it would be justified in enabling it at all Japanese held land bases. This fighter alone would make a huge difference in the effectiveness of the Japanese defenses.
H8K2 "Emily"
Engines: four Mitsubishi MK4Q Kasei 22 at 1,850hp.
Speed: 290mph
Ceiling: 29,000ft
Climb: 10 minutes, 12 seconds to 16,400ft. Average climb of 1,600ft per minute.
Range: 4,450 miles.
Armament: five 20mm Type 99 Model 1 cannon, one each in bow, dorsal, tail turrets and two beam hatches, and four 7.7mm Type 92 machine-guns, one each in ventral, port and starboard fuselage sides and cockpit hatches.
Ordanance: eight 250kg bombs or two 800kg torpedoes.
Number Built: 167 of all versions. The H8K2 was the major version with 112 built.
This is quite probably the most capable bomber the Japanese used in WWII. Quite frankly, compared to the Allies, the Japanese are screwed when it comes to attacking things. The H8K2 can at least carry 8 550lb bombs, that is enough to inflict some damage and is twice as much as any other Japanese bomber that I have seen. The H8K2 also has the destinction of being extremely durable, quite possibly the most durable aircraft feilded by any nation in WWII. Because the H8K2 is a flying boat it would have to be enabled only at ports and coastal bases (where it would spawn in the water like a PT Boat).
B6N2 Tenzan "Jill"
Engine: One Mitsubishi MK4T Kasei at 1,850hp.
Speed: 301mph
Ceiling: 29,670ft
Climb: 10 minutes, 24 seconds to 16,400ft. Average climb of 1,575ft per minute.
Range: 1,085 miles.
Armament: one flexible rear-firing 7.7mm Type 97 machine-gun and one flexible 7.7mm Type 97 machine-gun firing through a ventral tunnel.
Ordanance: one 800kg torpedo or similar weight of bombs.
Number Built: 1,268 of all versions. The B6N2 was the major version with 1,133 built.
The B6N2 would be a semi usable Japanese carrier based stirke plane. While its defensive armament, like the B5N that it replaced, remains effectively useless the B6N is armored and has self sealing fuel tanks. It saw wide use fron 1943 on and unlke the much more powerful B7A2, there can be no argument about using it from carriers.
Here is an image of the H8K 2 in version .31 of "Target: Rabaul":

Let's get this bird in AH before Target: Rabaul is released.