This is great news. For those of you worrying about imbalance, allow me to put your mind at ease with how Capcom worked this system for Capcom vs. Tatsunoko.
The control systems were balanced by keeping a balance between ease and versatility.
For example, using Ryu, with the simplified nunchuk control method, you could do a QCF fireball easier than the player with the Wavebird. However, the player with the Wavebird could do a HCF fireball while the nunchuk could not.
So, what is likely to happen is that the person who is using the simplified control method will have an easier time doing the moves that are available to them. However, the person using the complicated control method will have the full range of moves available to them.
Having used both methods, I found that I prefer having the full range of moves at the expense of being able to just whip them out with a single button press. However, I appreciate that I can play Capcom vs. Tatsunoko against a non-fighting game fan and they still have a good shot at winning or, at least, not sitting there frustrated because they're unable to do anything without me backing off and letting them experiment before I either let them win or I annhilate them.