I would be interested in 650B x 40 as long as they're close to the suppleness of the Compass tires that I'm currently using. They also use a herringbone pattern:
They're also made by Panaracer here in Japan, but the only way to get them in Japan is to order them from the US, which means they travel twice across the Pacific, which is wasteful and not exactly cheap.
Easy sealing would be a major selling point for me. Compass Babyshoe Pass (650Bx42) are not officially tubeless ready, unlike their most recently introduced formats. As you remember we got them to seal with caffelatex sealant, but only in the combination of liquid sealant, canned foam and rapid pumping with a floor pump that the second time around reached the physical ability limit of my weak cyclist arms. I would be more comfortable if I knew it was something I could easily do on my own, every time.
I did the tubeless conversion in May. This month I had to add sealant to the front tire after it started leaking air, so probably all the sealant had dried up. When I got back from a one week trip abroad last week, the rear had lost its pressure too. I then also added sealant.
I don't know if this would become easier with a different bead type. Sure, I would still need sealant for puncture protection, but having to top up sealant every month just to allow the tire to reliably hold air is something I didn't have to worry about with tubes... So any improvement there would be appreciated.
Compass claim good wear for their tires as they put more rubber on the middle of the tread, where it wears most. After about 2500 km my Babyshoe Pass tires look as good as new on the front while the center third of the lines in the middle of the above tread are worn smooth on the rear by now. On a road bike tire the center tread is mostly cosmetic as it's not needed for preventing aquaplaning or to aid traction, so I should be able to use it long after all of the center lines had worn smooth.
At the current wear rate I expect each set of tires to last me a year (~10,000 km), so personally I would probably only be in the market for 1-2 sets a year. Although I also still have a spare set of the Compass tires as I bought ahead to spread out the high shipping charges, I would be happy to try the new tires once they become available.