That would just be .... weird. TotA has a much more structured battle system than KH. I just don't get what you could possibly envision as a mix between those. This actually looks like a cross between an SRPG, lets say FFT just for ****s and giggles, and an action oriented RPG, like KH or TotA. Basically, it seems like strategy and placement will play a large role in how things turn out, yet there's still going to be a bit of a brawling portion in the fights.
As for the release method, it is also better because Mistwalker has already hinted several times that the game is very close to completion. I think one of those hints came out before we already knew the title. So there's a great chance we play this by the end of the year.
Hah, That's Redundant because you said the Same Thing Twice!