Power consumption values in this slide (via anandtech) are conspicuous by their absence. To me that suggests, like Ampere vs Turing, Ada's power increase is going to be all about pushing diminishing returns harder and damn the electric bills.
I was tenatively planning to skip this GPU generation, keeping my 3080 for 2 more years and replacing the rest of my elderly i7-4790k system; if power efficiency is as bad as "we're not going to talk about it" implies, that's a definite will skip.