I always think it's best to reserve judgment until all the camo comes off...my guess is that I'll end up liking the M235i just fine, and the M2 will hopefully be glorious.
As background, I really like the looks of the 135i (not surprising, I've owned two!), but as someone who doesn't particularly like the 128i looks, I'd assume I wouldn't be in love with the 228i/220i either.
As you might guess, I'm easily swayed by a more aggressive front fascia and big wheels