BTK here's some info for you.
HTC is putting the finishinig touches on the new KI-84 and there is at least one more aircrfat being worked on as we speak.
You can probably look to seeing the KI-84 available within teh next few days or so. Rumour has it that the other addition to the plane set that is being worked on is a bomber. So possibly the B-25 or HE-111 (just a guess here).
As far as the B-52 goes, you will never see it in AH, as it is a post war bomber and does not fit into the time frame in history HTC caters to. In general only aircraft that saw active service in WWII are reflected in AH (1939 to 1945).
Cheers,
RTR