What bothers me a lot more than any security risks - perhaps because (rightly or wrongly) I don't perceive them having that high a probability of occurrence - is what looks to be, emerging quite recently, a sheer lack of adequate product QC and process bullet-proofing before they release new updates; this is a concern, because I expect resulting impacts to have a much higher probability of occurrence that will affect me. Thom's article is very pointed on this matter and deserves attention in Adobe. Looking from the outside in, one gets the impression that the finance managers and marketing folks are fully in control there, while the developers/engineers are doing their level best pushing the leading edge of very complex software, but gasping for breath. Technically, LR remains a brilliant application. Again, this would appear to be less of a specific CC matter - rather more a broader corporate problem manifesting itself in various ways, including the management of the latest CC release. That said, I found the 2014 release came off without a hitch, but I did wait a while before installing that one too. I am still waiting for the dust to settle before upgrading to the 2015 package. I've lived without Dehaze and B&W sliders in the localized adjustment panels up to now and my photos tell me I can keep waiting. Don't need the aggravation - stress control is key to maintaining good health and good health is useful for making good photographs.
+ 1 well said. For sure the 2015 upgrade could have been handled a bit better.