For video, the 6D brings basically no advantage over a 5D2. And those can be found, used, for a lot less than you'd pay for a 6D. That would be my advice for anyone going for a full frame video DSLR and no budget for a 5D3 or D800.
More video modes like 60 frames with options for ALL-i, cleaner image at high ISO, better screen for those who use zacuto z-finders and such, longer clip recording, lighter body for support systems, manual audio straight out of the box, lens correction, faster processing chip for less lag with startup and recording, easier download of footage straight to laptops for onsite (SDE) event type editing via SD card which are also cheaper than CF, and oh wait... It's in production now whereas the 5D mark II is now phased out which means more support and availability for accessories like grips and such. Sure sounds like no advantage to me ^^
At least here where I live, a used 5D mark II out of warranty from a non dealer but in acceptable condition is only 100$ less than a brand new 6D body, obviously with a warranty. Of course, even if it was an official dealer, you also run the risk of buying into a high shutter count. Even if you're a photographer, there is no reason to buy the 5D mark II now unless you need better build quality (not as big of a difference as you may think), 1/8000th sec shutter or 1/200 flash sync which not many will need. There are ways around the shutter speed differences like ND filters and stopped down apertures, not everyone shoots in the frikkin snow, and if you're shooting with a flash onboard you can always do HSS. Event shooters usually shoot around 1/50th sec indoors anyway.