I just received an email response to my inquiry at Conid about the return of CAISO, and, with many apologies for the late response due to overwhelming email volume, was told that CAISO has been put on hold with no established return to production date. It would appear that their first challenge is upsizing their operation to meet current demand, and from the message chatter on these fora it is clear there is a lot of frustration in the pen community with that.
I had two Caisos. Stupidly, I sold one because I intended to get the new edition. Looks like that may not be possible now.
Oh well, I still have the second pen. That was a thank you gift from Conid (what they call a "Masterpiece" item) because of some testing I did. I am very attached to that Caiso.
Is it worth waiting for? In my opinion, the Caiso does not function any better than a Kingsize - unless you are into aerobatics. Because of the tricky bits, it is certainly more finicky. That may be why it was withdrawn. Given that all the Conids are good performers and come from a company that deserves our respect, why wait?. Unless, of course, you like techy things and rare pens.