Well, it looks like the weekend release possibility was a mistake, and it has
been pulled. _place_holder; _place_holder; It appears that the actual
release date is Tuesday, August 3rd. _place_holder; 
http://www.zdnet.com/blog/cell-phones/sprint-htc-evo-4g-froyo-update-rolling- out-next-week/4377
So, there is no need to keep checking until Tuesday.