E90 = sedan and E92 = coupe.

I think it's because they were gonna call the coupe the 4-series, kinda like how the 6-series is a big coupe, but changed their mind.

And I too, think it don't look so hot. The sedan looks better and the 330i sedan is more powerful than the 328i coupe. But the 335i coupe will probably be pretty nice.