I don't really care that they've changed it to the 4 series, but I have a few friends (who drive e36 M3s) who say that if they were thinking of buying a new M3, and BMW changed it to the M4, they wouldn't buy it because the "m3 heritage is gone"
I like it...but it seems everyone is going away from "heritage". To me, I think changing something that has stood the test of time means something. Still, it's a nice and aggressive looking car. I would definitely consider nit, along with that WRX concept in another post.