The adapter that so many Canon shooters have longed for has finally arrived. A powered Speed Booster from Metabones that adapts Canon EF (but not EF-S) lenses to micro 4/3 cameras such as the Panasonic GH4 - with full aperture control and image stabilization. I can't wait to get my hands on one - but until then, I'll have to live vicariously through Andrew's hands on experience with it.
That said, everyone is happy about this except Canon. My theory was that they were paying Metabones to delay the release of this adapter to keep Canon shooters from switching to the GH4 (that's a joke, for all of my literally minded readers). Seriously, though, I'll bet a lot of used Canon DSLRs go up on eBay in the next few days.