BMW's CEO, Norbert Reithofer made the following comment a while ago:

"[Reithofer] points to the twin-turbocharged inline-six in the 135i, 335i and 535i as a good indication of what the future might hold, particularly in the case of the M-badged variants that would make more use of forced induction rather than upgraded displacement and higher cylinder counts (not that they could get much higher). We can only dream, but with emissions standards increasing across the globe, it's the next logical evolution of the performance breed."

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I'm hoping that BMW decides to drop the 4 liter V8 from the M3 in the next M5 but with some upgrades first, direct injection and twin or sequential turbos. I could see them easily getting 500hp and 500 lb/ft of torque to match from that engine if the I6 twin turbo is any indication of potential power output. Tuners are getting some serious HP and Torque numbers out of those engines from just software upgrades alone. Considering the V10 in the M5 is already substantially heavier than the competition, I'm not exactly excited at the prospect of more weight under the hood, or anywhere on the car for that matter. I want the next M5 to be lighter, more than anything else.