Something interesting happened last weekend in California. Two mysterious IS F Sports were spotted at Lexus HQ by LexusEnthusiast.
This could be the rumoured debut of the 2.0t in the IS, eventually it will make its way into the RC as well.
Now consider that with the context that Lexus as recently as late 2014 had filed patents for IS 300 and RC 300. Paradoxically the 300 number seems to be signify an engine downsizing trend. The RC 300 wouldn't replace the RC 350, it would slot in below it. The theory goes that Lexus will use the 300 number to denote the 2.0T.
But you'll also notice that there is a car with white tape and a car with black tape. The current speculation seems to be that one represents a hybrid and the other a regular 350. If true I think we can logically assume that LExus is finally getting around to bringing the RC Hybrid over.