They shot the first wedding in 10-bit 4:2:2 ProRes HQ at 1080/60p rather than 4K, but I have to say that it looks pretty good - except for the moire on the groom's jacket at 1:10.
The second wedding was shot in 3840x2160 Ultra High Definition, again in ProRes.
This video has been password protected as private, but you can still see it in the URSA group I moderate over on Vimeo:
This one looks a lot cleaner. If you have a Vimeo Plus or Pro account, you can download it and see for yourself (if you don't, you can sign up for a Pro account here).
The best news, however, is ergonomic. After a couple of generations of Blackmagic cameras that have either looked like toasters or cellphones or weighed too much to carry, the Dreamers say "[The Mini] is incredibly well designed -- everything is exactly where you expect it to be..." (hat tip to nofilmschool.com for the quote).
At $2995 body-only, this camera is a pretty amazing value for the money. For those who can't afford the extra $2000 for the 4.6K version, this is going to be a great, 10-bit entry-level cinema camera.
Blackmagic is clearly going to have to drop the price of the vanilla $2995 Production Camera 4K when URSA Mini 4K starts shipping in volume.