Awesome! I really like the 26650 size light and am quite suprised I have only sold a few of them.
I like it too -- and in better economic times, I'd order one.
However, with limited flashlight dollars to allocate, I'm not doing any more 26650 until they improve the energy density. The 26650 is massive compared to the 18650, yet gives you only about 33% more capacity (4000 mAh vs. 3000).
I currently have only one light that uses 26650 -- ElektroLumens' Big Bruiser, which is a triple-XML light. It is powered by a single 26650, and for that application, it makes sense -- because the light draws 10A and the MNKE 26650 cells are the only thing that can sustain that.
In the case of your single-XML lights, 18650 can provide ample power, so the 26650 adds a lot of bulk but only 33% more battery life.
Also -- I have to be honest here -- as much as I love the EDC series, the XML-xxx50 series with the interchangeable heads just doesn't do it for me aesthetically. I like the look of the big one (26650), but don't like the battery; and the smaller ones just look a bit clunky. To me. I may be the only person on earth who feels this way, but speaking as a huge fan of most of your stuff, I feel I owe you the honest feedback.