Maybe it will be the start of a new 250GP replacement class??
It was announced at the British GP that 250GP's will stay for definate until at least 2011!
As for the V-twin, I reckon it's the way for SM to go. You need revs to get power, and singles don't like being revved, the v-twin has smaller pistons, valves, rods, etc, so less reciprocating mass in the engine, therefore the potential to rev and produce more power, more reliably.
No doubt now that someone else has thought of it, the japs will do what they do best and copy it!