http://www.espn.com/boxing/story/_/i...ht-set-july-20

Manny Pacquiao will challenge welterweight world titleholder Keith Thurman on July 20 in the main event of a Fox pay-per-view card, Premier Boxing Champions announced Saturday night during its telecast of the Jarrett Hurd-Julian Williams junior middleweight world title fight.

Pacquiao-Thurman will take place in Las Vegas, a PBC source told ESPN, but no site was formally announced and likely won't be until a news conference with the fighters in the next couple of weeks.
All I know is if Thurman comes out looking rusty like his last fight against Lopez, I expect Manny to stop him around the 9th/10th round.