19th corresponds with the Technet Virtual conference - I could understand an announcement being made on this date, but not sure that RTM would be available then...
(This is terrible, its some sort of bad habit - scanning XDA for decent WM6.5 build, here for Windows 7, Elsewhere for Office 2010...wasting too much time - AND even worse I've been in the industry for 15years, and each time a new release is out end up testing various CTPs,Betas,RCs,RTMs..... still I've got to say from as far back as Win95 OSR2 Windows 7 is the only non-release OS that I've deployed to the entire house - including the media pc, the kids and wifes' laptops and my laptop!).