3.3L I6 in this car? I don't think so. People already complain that the car is too front heavy, and a few more pounds added by the 3.3 L engine will just make car even more unbalance. I think they will either have a new 3L I6 engine to replace this aging block or some type of force induction to aid it.
Why would the fact that Lexus enlarged the displacement of the 4L V8 to 4.3L have anything to do with an enlargement in displacement of the 3L V6? The two seem completely unrelated. Also, additional poundage does not necessarily come with more displacement. The current engine could simply be bored and/or stroked to give the additional displacement at a weight SAVINGS.