So I was reading up on the SMG III on my '08 M5-- and came across this...
I truly hope that this is/will be true!
"Recent developments by other manufacturers, specifically the production of the more powerful Mercedes-Benz E63 AMG (507 bhp (378 kW; 514 PS)), Audi RS6 (C6) (426 kW (579 PS; 571 bhp)), and the second generation Cadillac CTS-V (556 bhp (415 kW; 564 PS)) which bested the M5's Nürburgring lap time, has inspired BMW to go back to the drawing board. The 2011 M5's power output is expected to hit or exceed the 600 bhp (447 kW; 608 PS) mark, up from its current 500 bhp (373 kW; 507 PS)."