Akazora

No, UBW's story is over. We have to wait for the Heaven's Feel movie(s) now, which will be released eventually. No word on an official date though. It's an alternate version of the 5th Grail War that focuses on Sakura, Rider, Illya, and Kirei, and is meant to be seen after UBW and acts as Fate/stay night's true finale, though since it doesn't chronologically occur after UBW it can't be considered a sequel or a "season 3".