It's quite logical that current Pentax users have little need for class leading video, because current Pentax DSLRs don't deliver class leading video. Self-selection at work. That being said, it seems to me that a new Pentax camera - whether full frame or not - should be aimed not only at the existing Pentax user base, but also to attract new customers. To that effect, 4K video support would be a distinguishing feature that would put Pentax at the front of the pack. But based on recent executive statements, it's pretty clear that video isn't a priority at Ricoh. In the not too distant future however, we can expect that
not having 4K support on a flagship product may put them in an awkward position... (See for example
this interview with a Nikon manager at Photokina where he states: "In my opinion, 4K is too much. Our current movie functionality is enough for our users. But some of our competitors, like Panasonic and Sony are adding 4K so we should aim for the same level of functionality in order to compete.")