A Ki-84 would be nice since it would presumably be competative in the MA

I think the main problem isn't lack of updates; I think it's lack of updates to the MA-competative equipment--particularly fighters. We haven't had a top-5 fighter added to AH since the LA7 was added. We haven't had a heavy bomber added since the LANC. The most recent updates have sort of ignored the MA planeset in favor of filling out the historical/event planesets, which causes some stagnation to set in (this is especially bad since there is but one MA, so variety is already limited).
Filling out the historical planeset is fine, but honestly, what is more important--something that'll be used in a scenario maybe 1 or 2 times a year, or something that'll be used thousands of times a week?
Unfortunately with so much of HTC's work being focused on the ToD aspect of AH2, I fear that the MA may continue to be neglected. The term that was used in AW was "maintenance mode", and I wonder if the MA is being treated as such.
J_A_B