M20 Super Bazookas (280mm of penetration, to really stop those panzers)
T29/30/34 Heavy Tanks might make into combat fully, so the M26 ends up getting called a medium tank earlier.
The Centurion Tanks get to fight and thus we get more tea delivered to Germany.
The T-44 and IS-3 get to eat German steel as the Soviets continue to march forward. (Perhaps a proto-Ak-47 is in service too, though maybe not due to production delays)
The P-80A, Meteor and Vampire get to play with the remnants of the Luftwaffe.
The USAAF get's the Superbolt, Super Mustang and more B-29's (B-50's get to play aswell) if the JB series is continued (and because I really like Allied missiles) we'd see things like the JB-3 Tiamat, Azon bombs and even the Bat Bomb (ASM-N-2 not ht the other one) and finally the Germans get to doge VB-6 Felixes. (because who doesn't want to drop IR bombs with a CEP of 26m)