I will keep my '09 and will buy a 2nd or 3rd year Nismo version. This gives me plenty of time to save up the cash and gives Nissan a chance to work out the bugs related to the propulsion system, whatever that turns out to be. It's common sense that they won't make a lesser performing vehicle in this day and age given the competition.
As a side note, I hope they simply call it the "Z". Simple, elegant, lethal...