I feel the need to chime in here and propose why I find the 6D to be exactly what I want.
First of all, I am primarily a filmmaker, and a photographer second. I currently use a 550 for my photography and have been using anything from the Red One to the 7D and 5DmkII for my filmmaking. When the 5DmkIII was announced, I was extremely excited until the price was revealed. For my personal budget, spending $3500 on a FF camera with mild video upgrades isn't justifiable when I can rent. I do however value a FF for still photography and the amazing low light video capability. For that reason I have been close to pulling the trigger on a 5DmkII for the past few months, all along held back by wanting to see what Canon's next move might be. With the T4i, I was once again disappointed with what appeared to be a repackaged T2i with a swivel screen (essentially a T3i). The auto focus on video was not particularly interesting to me.
So now the 6D comes out and at $2100 is looks very compelling. First of all, it's a FF which is slightly higher in price than the 5DmkII. Secondly, unlike the mmII, it gives me 60fps which can be useful (I wish that it was at 1080 and not 720 though). Thirdly, it promises to have improved moire and rolling shutter, definite bonus for video. It lacks a headphone jack, but I usually record audio separately anyway so that's not a deal killer for me.
So essentially what it comes down to is that for a couple of hundred more, I get a FF camera which has current CPU technology, improves on the mkII video quality and options, and brings my photography IQ up a notch too. I do own several decent EF lenses which I will be able to use with the 6D and I am familiar with Canon which doesn't require any additional learning.
I feel that for people like me, this is a win-win product. I know about the other options out there, like the new Panasonic GH3, or the Sony a99. I honestly don't like the feel of the video coming from both of those cameras, for lack of a better term it lacks the cinematic quality that Canon (and Nikon) cameras have. I suppose I would consider a Nikon d600, but I am not sure what that would get me for essentially the same exact price of the 6D.
I am also hopeful that a new version of Magic Lantern will unlock more functionality from this camera. Considering how much they were able to do with the 5DmkII, I hope that they will be able to eventually bring 1080p at 60fps and clean HDMI out.