Gene, while I'm -or I wasn't, a fan of Mastelotto, I have to say that what I saw was fantastic. His style was perfectly matched with the other two. The obvious lead drummer was Harrison, the "musical" drummer was Rieflin, and the percussion/artifacts/contraptions/found objects drummer was Mastelotto. I don't know, maybe he has been practicing, a lot, maybe it's these 2 guys' influence. He sounded much better than when he was paired with Brufford, of whom I'm a big fan.
As far as new material, none was played. It was very rare that it was kind of a greatest hits show, something Fripp has always said to be against of. Some of the parts we're used to be played by sax, guitar, keyboards, etc. were played by the drummers and the effect was surreal. The 3 drummer solo is on YouTube, check it out, if you haven't.
I hope I'm wrong, but I think this is it for KC, and the best we can hope for is audio or video of this tour.
Spoiler alert: the last encore was 21st Century Schizoid Man with a SICK drum solo by Harrison.
Lastly, I was sad that Belew wasn't part of this incarnation and that they chose not to play any song from the 3 80's albums. In my opinion the (very) weak link is Jacko Jackszik (I tried, but I'm sure I got the spelling wrong again) as a vocalist. His guitar chops are par with the rest.
PS: I was VERY sad that there were a lot of empty seats.
Cheers