probably just a processor update can bring some video improvements:
* no more aliasing/moire, like in the 5D3
* IPB and all-I codecs, like the 5D3
* heavy NR applied by default and no-matter-what, 5D3-like but just not so high (clean ISO 3200?)
then it would be a great upgrade for video shooters
add AF microadjustment, and it's a great upgrade for stills shooters too (and yes: that feature should be present in absolutely every DSLR: it costs basically nothing, and anyone using AF and half-decent lenses just shouldn't touch a camera that doesn't have it)