Just for fun, I predict the engine won't grow a lot in the next generation. Probably 4.5 or 5.0 maximum. They're probably just gonna make it very aerodynamical and give it a very good automatic transmission so that the car can accelerate fast without too much horsepower (being economic and not very polluting) like the current car. But just see how it's fantastic: it only needs 290 horsepower to accelerate from 0-100 km/h in 6.6 seconds even if its heavy and kind of square. Just compare to the Q45 from Infiniti: it has 340 hp (50 hp advantage!) and just manages to do 0-100 km/h in 7.2 seconds. Anyway, I hope they make the new LS more sexy this time because I know Lexus is able to do it but just doesn't want to.