While checking our inbox one last time before heading out for the night, we stumbled upon an email from our good friend Carlos over at Motorpasion.  In his email, Carlos pointed us to some spy photos his website ran today showing the new Mercedes-Benz SLR McLaren testing in Sierra Nevada, Spain.

Although there's still no official confirmation from Mercedes, Auto Motor und Sport's earlier reports that the SLR will be upgraded as early as September appear to be more fact than fiction.

We'll keep you posted if we hear anything new; in the meantime, head over to Motorpasion to view more spy shots of the Mercedes SLR McLaren prototype in all its magnificent glory.