I have to say I'm a little bit jealous of Canon's Radio Flash system (not to jealous of course, as Canon is terrible at flash).
We do a lot of on-location portrait work, and the SB's have become an integral part of the setup. More than a few times I've bumped up against the limits of what CLS will let you do... typically because of the line of sight limitation of Nikon's current system. A radio based system would go a long way toward rectifying these issues.
So a question for you folks? If Nikon released a radio based CLS II system, would you switch? What if it were backward compatible? How much would you be willing to pay?
Talk amongst yourselves.