This photo was released on Lexus press release site as a teaser for the upcoming Lexus IS-F

And here’s an idea of what the final full rear view of the IS-F may look like:

Here’s the official press release from Lexus:
The Lexus IS-F is now an official reality. The Lexus North American Pressroom has posted the following press release, complete with the picture at the top left of this story:
New Lexus Performance Vehicles to Make World Debut at 2007 North American International Auto Show
Lexus will stage the world premiere of the 2008 IS-F sport performance car and an exciting concept vehicle at a press conference at the 2007 North American International Auto Show in Detroit.
The IS-F is an all-new high-performance version of the popular Lexus IS 250/350 sport sedans. It will feature unique styling and a substantial boost in power from a V8 powerplant that will captivate performance car enthusiasts when it goes on sale next year. In addition to the IS-F, Lexus will unveil an exotic sports concept.
The press conference will be held on Monday, January 8 at 11:25 a.m. EST in the Riverview Ballroom in COBO Center and simulcast live to the Lexus display area at the show. A video clip of the press conference will be available via the Lexus.com and pressroom.lexus.com Web sites immediately following the event.
To view the original press release, click here.