Plenty of people posting about having received their 1080 Founders Editions on other forums I frequent (Overclock.net, Reddit, Shacknews etc.) so I think those that pre-ordered FE are receiving theirs, sounds like it performs well but the fans aren't great.
I'm sure as soon as the vendor partner versions ship it will improve both the stock and fans.
Personally I'm looking forward to see the 1070 partner editions (especially Gigabyte G1 Gamer, MSI, EVGA FTW etc).
