The video on the K-01 is as good as any other Pentax - which is to say, it doesn't compare to Panasonic, Sony, or Canon offerings, but generally "good enough" is good enough.
For cases, IMO the Marc Newson limited edition leather case was insanely overpriced. I like neoprene "pouch" cases; the Op/Tech Soft Pouch D-Compact fits with the pancake 40. For a small prime like the DA 35 or the DA Limiteds, the D-Offset is a perfect fit. There are also some Chinese pouches out there (different colors, different brands, but they appear to be from the same factory) that were originally listed for the Nikon P500 or Canon SX60; they fit okay for small lenses.
Edit: I will add that I have both of the Op/Tech cases - the D-compact is my choice for pancake lenses and the D-offset for small primes and the "snubnose" F35-70. I have a yellow Chinese P500 case for storing my Bumblebee and a light blue one for my Smurf (why, yes, I have been accused of having OCD; why do you ask?
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