Not happening. It wouldn't surprise me that BMW would go to a V6, as it makes alot more sense as far as packaging goes, but 3 turbos? You don't need 3. Hell, you don't NEED 2. The amount of heat and cooling capacity required would negatively offset the smaller packaging of a V6. Not to mention, the increased weight and cost of the extra turbo and plumbing.
This is about as likely to happen as the M3 pick-up truck.
'06 EVO IX MR 10.51@127mph (1.40 60ft)
World's Quickest/Fastest Stock Turbo/Motor Evolution
400whp/397wtq. Stock Turbo. Stock Cams. E85 Powered. Tuned by JSDyno.com
Sweet vids of my car kicking ass...