I'm betting Tom will be able to give us all a definitive word when he comes back from ML next week. If not, I'll hammer on them again end of the month when I go out there.
It's always very hard for a mfr to time any of this kind of thing, because they want to advance their state of the art, but don't want to alienate their existing user base.
My guess is that ML will come up with an amicable solution for everyone, especially considering how heavy Summits are!
Another good reason to have a good relationship with your dealer, if you have one conveniently located near you!