Yes, Dave has been working on this for a while. It's a 100% Dave designed meter rather than a co-branded meter like the Brymen. They have been sneaking their way into the videos over the last month or so, but this last video is definitely the most open appearance. He used a "super secret meter" at one point that had a 15V diode tester, so that's probably on the list of features.
Yes, 15V diode test.
Not entirely true that it's 100% designed by me. I set the specs, and a multimeter company is doing the actual design. But I am getting nitty gritty on the circuit level though.
There is only so much I can do, and many compromises have had to be made, and I've had to let a few things slide that I would have fixed myself if it was me doing the design. But it's hard to go back and forth on tiny changes like that, you can't micro-manage a design team you have no direct contact with.
I'd love to actually blog the process but I can't.
Dave mentioned in the Batteroo live stream that he was waiting on a final prototype (probably the one shown in the video you are referring to since it should be here by now), and after testing it Dave is expecting to be ready for a public unveiling. (Sorry, I'm too lazy to find a time stamp for any of this)
Supposed final prototype is on a truck somewhere.
I have 4-5 other prototypes that look identical, just some minor tweaks on the new one.