I agree it is kind of strange. Those were Kentucky balls, so it is kind of surprising they are still listed. I would have also thought they would be discontinued. Some sites have them, but the selection of weights is very limited. Probably going to be discontinued very soon, which leads back to the original question of what will be released to replace them.
The most recent Columbia ball on the USBC approved list is the Dynamic Swing Pearl. Almost makes one wonder if Columbia is sticking around or if it will eventually be phased out in its entirety.