The next generation Mercedes-Benz SLK sportscar has been spotted testing on public roads.? It?s showing a square front grille, borrowing from the SLS ?gullwing?.? There are daytime running lights, new handles and larger mirrors along with the standard retractable hardtop roof.? Engine choices will include a naturally aspired V-6 and possibly a diesel.? The AMG model will probably uses a 3.5-liter twin-turbo V-6 rated as high as 470-hp. The 2012 SLK is due in the spring of 2011.? (2010 SLK is shown here.)