I hope they change to brushless too, that'd be a great move since that's the number one problem with their wheel - the brush/commutator interface of these cheap motors they've been using. As far as switching existing wheels, you'd almost certainly need to switch the PCB for that to be practical, and that might mean that the wheel will no longer work with the older consoles. (But also might mean it would work with the newer consoles!) However, I would be surprised if they gave us such an easy way to update our wheels. Pleasantly, I might add, but very very surprised.
Regarding the warranty question above: I would guess that there isn't a snowball's chance in hell that they will extend your warranty by 2 years on the motor packs every time they fail. I base this on the fact that I have never heard of a company doing that, ever.