Today, Apple released the 10th developer beta of iOS 11, along with the ninth public beta. You won't find any new front-facing features in build 15A5372a, and it comes in at around 40MB, depending on the device you're using and assuming that you're coming from the previous beta.
Note that if you're upgrading from an earlier build though, including beta 5 or 6 (public beta 4 or 5), the installation may "stall indefinitely". The workaround is to go to your device's settings and delete the seed that's causing the issue, and then reinstall from the Software Update page, making sure to stay in that page of Settings until the update is ready to install.
Some third-party apps may still not work as expected; these include Audiobus 3, MobileIron Mobile@Work, Tweetbot, and Square Cash. Presumably, this is something that's up to the developers to fix at this point.
Last week, Apple began sending out invitations for an event on September 12, where it's expected to announce three new iPhones, a new Apple Watch that supports cellular connectivity, and a new Apple TV that supports 4K and HDR. If history is any indication, the firm will release GM seeds of the new versions of iOS, macOS, watchOS, and tvOS immediately after.
And if the new iPhone is released on September 22, as it's rumored to be, iOS 11 will likely be available to the public two days earlier.