mazda has been touting this car as "heavily revised." to me, that signals more than just a new bumper, but i guess we'll see. i think (hope) they realize that slight cosmetic changes aren't going to significantly improve sales, but 350Z or 335i power levels would. i also think (again, hope) that w/ the MS MX-5 coming out, they would try to maintain the RX-8 as the top sportscar in the lineup.
i'd be happier if they'd keep the 1.3 but cut 400 pounds of weight off the car, but a new engine is probably more likely.