Some key distinguishers are a longer wheelbase, a high nosecone, U-shaped sidepods and a new intake for cooling the hybrid system.
Once again, the drivers for McLaren will include Jenson Button and Lewis Hamilton.
As previously reported, key changes to the car for 2011 include a switch to Pirelli tires, the reintroduction of the Kinetic Energy Recovery System (KERS), an increase in weight of the car plus the driver to 1,411 pounds, and the addition of a movable rear wing.
The MP4-26 on show, however, was far from complete, coming with a plastic engine and exhaust system in order to keep some technical details secret. Look out for the completed car at the 2011 Formula 1 season opener in Bahrain on March 11-13.