Though some find the Lexus LS series a bit on the plain side for a premium executive luxury sedan, there are also those that just can't get over its pleasing lines. Whatever camp you fall into, you're unlikely to change your mind for the 2010 model year, as official images revealed today show little is changing. Likewise, the GS and IS lines get minor cosmetic upgrades but largely carry forward their current design cues, though a much-needed performance element is being added to the IS-F.

Updates to the LS are primarily visual, with previous leaks confirming the grille will be tweaked to match the newer HS250h,  along with updated side-mirror turn signals, new wheels and a slightly modified rear bumper/taillight combo. The latest photos show updated headlights, while Lexus promises major upgrades to the equipment specifications and seating configuration inside the car. Driving dynamics are also said to be improved.

For the GS line, a similar set of updates are shown, with the hybrid getting more unique elements to set it apart from the rest of the GS range. New audio and navigation systems, an updated color range and enhanced safety features round out the GS updates.

The IS stays true to the theme of minimal styling changes and updated interior features, with a new F-Sport package (shown here) and new nav and audio systems now available. The big news for the IS range, however, is the addition of a limited-slip differential (LSD) to the high-performance IS-F.

Full details and information on the updated LS, GS and IS ranges will be revealed at the Frankfurt Auto Show on September 15.