Nice pics...couple of observations:
The 300 replacement looks really nice. Not a fan of the front fascia, but I can understand why they may have gone that route for safety and slightly better gas mileage (considering many if not a large majority of these will never leave pavement).
From the spy pictures, it looks like there is a split gate rear...The rear seam is at the right location for it. Also, not sure why any maker would want to further increase cost by adding a split seam.
Looks like the new LX replacement is nearing completion...the current front end doesn't fit the current Lexus design philosophy with their spindle grills and stuff.
As for Lexus, I do find it somewhat odd that they would drop the TT engine into this vehicle...considering it's one of their more expensive crown vehicles. If anything, I'd expect them to use some variant of a forced induction V8 for some bragging rights...maybe they will surprise the US market with such an engine to further differentiate the two brands?