About the powerdome... and this is pure speculation on my part... But BMW has used prosthetic parts before to cover up features they didn't want to reveal. Here is a comparison between an older spy photo and the current one. IMO, the older photos seemed to have an over-bulbous hood that they were happy to un-camouflage. New photos are under camo again. Just sayin...
More bulbous hood pics here:
http://www.f30post.com/forums/showthread.php?t=668712