Jason, I'll be shocked if we see a naturally aspirated 6 cylinder engine in the F3x 3 series.
For that matter, I'll be pretty surprised if there are any naturally aspirated engines in any F3x-based vehicle sold anywhere in the world.
Originally Posted by Jason
No engine options have been confirmed yet, but expect it to include a full range of turbo and naturally aspirated 6-cyl, 4-cyl, and possibly even a new 3-cyl motor. The 28i will likely be powered by the same N20 turbo 4-cylinder powering the X1 xDrive28i and the upcoming Z4 sDrive28i, and the F30 335i/340i will again be powered by a turbo 6-cylinder engine.