From the suggested specs, it would seem that there has been almost no improvements/benefits to the video element of the new 5D3/X about to be announced shortly.
There seems to have been no improvement with regards to: Moire, aliasing, rolling shutter, higher frame rates - In fact it would seem pretty much the same standard as the trusty 5D2.
Videographers who purchased the 5D2 for its video capabilities and not to use it for stills will probably be content to leave the 5D3/x completely alone and save a fortune by sticking with the 5D2. I know I will.
An extra CF card slot won't tempt me, that's for sure. I just hope for Canon's sake that there's a lot of photographers out there wanting to buy it!
The thing hasn't even been released yet! What makes you think that the moire, banding, and rolling shutter haven't been improved? It's just too hard to say, we have basic specs right now and that's it, no details.
I suspect they didn't add any new features because it would eat into the sales of the 4K cinema dslr that is supposed to be announced within the year. I'm sure the video will be improved, but the 5D series is a still camera, plain and simple. The popularity of the 5DII among filmmakers was NOT something that Canon predicted, and it's clear they are trying to separate the two.
There are some photographers that NEVER use the video feature, so why make them pay for features they aren't going to use? On the same note, there are videographers that dont need 6fps, autofocus, or any other still features, so why should they have to pay for them. It makes much more sense to make one dedicated to stills and one dedicated to video, which Canon is doing.