What you are looking at might quite possibly be a slightly refreshed 2011 Lexus IS sedan. Tweeks apparent in from pictures include-
- LED daytime running lights at the bottom of the headlights
- Adaptive cruise control option
- Update steering wheel
- New wheel pattern
- New fog light design
- New tail lights
The IS was last retouched in 2009 which would mean that a these minor tweeks would carry the current generation over until 2012 when a full refresh will probably take place.
For more pictures and information check out the Lexus Enthusiast.