In a surprising move, Apple just released iOS 10 developer beta 7 and public beta 6, just four days after releasing the last betas. Apple hasn't pushed out this many betas since iOS 5, and they're on pace to break that record.
From the update notes, there doesn't seem to be anything in terms of new features; Most of it is just a long list of known issues from previous and current beta builds, but there may have been some critical issues fixed and some minor performance enhancements, due to its quick release.
With so many known issues still to address, it's possible we'll see another beta or two before the GM version comes out to developers in about 3 weeks coinciding with the rumored September 7 launch date for the iPhone 7.
iOS 10 has a lot of cool new features, so if you can't wait another month until its official release, you can sign up for the beta program and get iOS 10 on your iPad, iPhone, or iPod touch right now.