So, I installed CC 2015. The installation went fine except that, a) none of my additional editing software (Nik, onOne, Topaz, etc.) is linked to CC 2015, b) my PS CC 2014 app was removed, and c) none of the installation scripts for Nik, Topaz, DxO FilmPak or onOne Perfect Photo 8.5 recognize CC 2015. In other words, I have zero access to the tools I need to create.
I've contacted the vendors individually, and expect updated install scripts for currently available software. But I have no intention of upgrading some things, like Perfect Photo 8.5 which is now in version 9, and I suspect that they will not be issuing install scripts for old software to recognize CC 2015. This is a HUGE problem and I expect Adobe to figure out how to fix it.