Leftlane News has published possible spy shots of the upcoming Lexus HS 250h hybrid sedan (click for larger versions):
I can certainly see some Lexus cues with the hybrid door badging and the LS rear lights, but obviously this is an extremely well-camouflaged vehicle.
Update: TPP commenter Eddie also brings up the obviously Lexus side mirrors:
Another telling tale, the front headlights:
[Source: Leftlane News]