Arstechnica, Engadget, The Verge, etc. The consensus mostly seems to be that the 2080 is around the same performance as the 1080ti, which is a little odd as it's retailing for $100 more than the 1080ti launched at in March of 2017. The 2080ti is the clear winner in terms of performance, but it's also $1200. Now that the bitcoin craze has died down a bit, it seems more likely than not that all of these cards will be findable at the retail price, but unless you absolutely must have 4k/60fps performance it still seems like a 1080ti is a good bet for the near future, at least until more games support raytracing and the higher-end features. If I were buying a PC now I'd shoot for 1440p/144hz as the sweet spot, which a 1080 or 1080ti should hit reliably for most games.
That said, the raytracing stuff does look pretty: