I am looking forward to a full frame mirrorless (EVIL) camera from Canon!!
This article is very informative for everybody looking for an alternative to traditional DSLR-cameras - thank you R. Butler! It answers the question what you possibly will miss and what you get by choosing a mirrorless system.
I already made my choice: I traded my excellent, but heavy Nikon-D700 equipment for a lightweight Panasonic Lumix GH2-system - and I never look back, particularly not when I am on a hiking tour in the Alps...
Of course there are some (minor) drawbacks in particular situations compared to high end DSLR's, but mostly you will appreciate the convenience of this handy camera; and if you shoot RAW and develop with DxO Optics Pro, you also will be delighted about the image quality you bring out of the relatively small four thirds sensor!