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We saw speculation about a V8 M5 as far back as May, 2008, and more recent speculation that it was going to be a twin-turbo V10 instead, but now Inside Line is reporting that BMW reps have confirmed that a V8 will indeed be in the next M5's engine bay – although they didn't confirm which one. Most likely, it will be the 4.4-liter turbocharged V8 that first appeared in the X5M and X6M. With 555 horsepower and 500 pound-feet of torque, it falls right in the ballpark with other supersedan outputs. That new powerplant will sit in a new cradle as well, with the all-new 5-Series just months away. Around these parts, we're starting to refer to this next generation M5 as the Goldilocks Edition. Six wasn't enough, ten was too much and eight is just right. Thanks for the tip, Derick!