Its nice to hear that it probably won't be a handheld game. They were speculating on 8-4 just last week that it would be a 3ds game because its a longstanding tradition to release DQ on the platform where the most people can play it. Honestly I don't expect much. I just hope it's a beautiful game with memorable characters that keeps its RPG elements intact. It seems like every RPG battle system for an entire generation has been some overly complicated, free movement, AI dependent, pseudo real-time clusterfuck.
Every non-MMO Dragon Quest game has retained the same battle system since the original. I doubt that you have much to worry about on that front, though I don't agree with your general assessment on the genre..
I mean I could name like 5 examples if you want. The reason I worry that it would happen to Dragon Quest now is because they basically skipped the generation where it came in vogue, having released their last proper game on DS where that kind of combat probably wouldn't have been possible.