Spied testing in America, this is the Mercedes S63 AMG. With a covered front bumper suggesting some alterations to the frontal design. This leaves us wondering the initially designated 2009 'across-the-range' facelift could be pulled earlier (Following BMW's New 7 Series debut).
There should be some technology upgrades as mere aerodynamics testing on the new bumper must be done in a wind tunnel, starting it up going round and round suggests other tests are being done.
Hit the jump to see other photos (Of which we're not really sure what's there to look out for)
