I think from what I read about Yamaha's tests they were only putting about 15% of the power through the front wheel (on tarmac) and only when on the throttle, by which time the front wheel has done most of it's work so the front is not loaded anymore than usual for braking or cornering. The idea being that should the back start to spin then the power will be transfered to the front reducing the spin and allowing the front to pull you through the turn rather it trying to slow down. Also once on the power the bike should be able to hold a tighter line.
It has been tested on an R1 - don't know how good it was though, but it issupposed to be good in the wet.
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