I got the new E90 in the stable and snapped some quick comparison shots. The E90 is definatly bigger from all angles, but the interior still feels as perfectly sized as the E46 does, with just a bit more rear legroom. (I like the tight.. comfortable feeling of the e46 interior, its not too small, not too big, just cozy.. and the e90 has the same feeling.)
I have more pix and will try to post them soon once I get my laptop back from HP... grr