I must be honest. I only read about half of these comments; there were just so many.
I really am looking forward to a new movie, but I just can't figure out what in the heck they would do to up the action from Kung Fu Panda 3. I mean, we got Po learning kung fu in KFP1, then him gaining inner peace in KFP2, and finally he gains the power of chi in KFP3.
I see this as a progression. First, he gains control over his body. Then his mind. And then his emotions. But...what would be next? Would we have Po as an old teacher in the next one, or something?
Now, I'm almost certainly showing my ignorance here, but I couldn't really find any kind of other cool mystical Chinese material for them to use as the stories progress. I think they may have to bring in some kind of other countries, like Japan or something. We could get some ninjitsu going and basically bring in some other Eastern cultures and their mysticisms.
Otherwise, I'm pretty much stumped. I'm sure they'll make another good movie, but I don't know how. I'm ready to be surprised.