I was pondering that if you were going to shrink the heads of future figures, it would be a problem for the earlier releases of the blue-uniformed versions. But then I got to thinking... All you'd have to do is take the uniform off of the previous figure blue-uniform figure, and put it on the flight suit body that has the smaller head. The problem would be easily solved then.
Certainly if TV figures are made, the heads will have to be drastically reduced in size, because the heads aren't really that big in the TV line art. The movie has a different style, and the characters look shorter with larger heads.
Plus, you could always come out with smaller heads that are sold seperately, that can be interchanged with the figures (since the heads will be removable on the flight suit versions). That way, you could have them all in scale with each other, but then you could also please the fans that want the heads to be smaller. Just an idea, since you're doing accessory packs.
Ahem, and speaking of accessory packs, it'd be frickin' sweet to have a bar table with several beer glasses as an accesory pack. Well, that'd never sell, but it'd sure be fun to have.
Anyway, it seems the overall point I'm trying to make is customizability (is that a real word?) in your figures. Some fans like the big heads, many want them small. Some fans would like more unique accessories, some would like more unique hands. Since you're stuck with that Toynami body, it's best to release a bunch of packs so that each person can customize the figure to his/her own specific tastes. I'd make my heads smaller, and I'd like some cooler hands. Oh yeah, and a new pair of glasses for Max.