Would definitely like one with 21700. And L6 size head. With the new Oslon emitters, it should match the actual GT in throw.But Lumintop needs to do better with the reflector quality. The D1S reflector is much smoother than the reflector in the Mini.
Was there even a mention of a NW option? That would be where I’d go for this.
As to other sizes: I’m not sure that going down to a AAA-sized battery would work well, really. Runtime would be very short at anything above minimal brightness. But as a further novelty part of the ‘GT’ line, I almost expect it to be proposed. The midi format is already pretty competetively occupied, so it probably wouldn’t be as potentially lucrative as the much smaller sizes could be.