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Originally Posted by Red Bread
The current 1er is sort of a mix of E9x 3er chassis, with decontented suspension. Many of the lighter aluminum parts were replaced with heavier, and cheaper steel parts. Rumors point to the next 1er getting its own chassis, freeing up the ability for it to be significantly lighter than the current chassis.
The US spec Subie STi makes the same power (at different rpm) with a single turbo, 2.5l four as the N54 twin turbo I6, so there's no reason to think that it can't be done. You're correct that it would likely require either a larger turbo, direct injection or both, but it's certainly possible. You could also eject nearly 100 pounds (of rolling mass) just be dumping the standard run flats.
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I heard they were still going to offer the I6 turbo, but drop the base I6 and replace with a turbo I4 with around 250bhp. Of course, at this point it could all be conjecture, but future EPA mileage laws in the US and emission laws in Europe point to smaller engines/better fuel economy.