Thanks to all who sent the GolfWRX post identifying the latest Costco "Kirkland" ball to be offered for sale, just as the CEO promised in January. The original drew great attention and reviews and after selling out, has become a much-demanded cult classic. 
While they are billing it as the same ball with "Hot List" branding, the current iteration is only for sale to Costco members, with a 2-order-per-membership limit and no certainty the latest ball is the same as the last (given that it was likely a one-off production run of old Taylor Made cores).
Nonetheless, it spices up discussions about the ball, adds more intrigue to the lawsuits and whether this is a legitimate contender in the golf ball market, as some originals proved to be, or just an occasional stunt.
Here they are Costco members...