Just over a week after the first, Apple has released today the second beta versions of iOS 13.1 It's from iPadOS 13.1, both with build 17A5831c.
In addition to these two, also came the ninth (!) Beta version of tvOS 13 (compilation 17J5573a).
The iOS 13.1 beta, as we follow, will bring some previously announced news for iOS 13 that will not be in its release version (13.0), expected to arrive in the coming weeks.
Apple is expected to release iOS 13, iPadOS 13, watchOS 6 and tvOS 13 the week after its September 10th special event. Already macOS Catalina 10.15 should be released some time after them.
Update 9/4/2019 6:45 PM
For those interested, these new system test builds have also arrived at the Apple Beta Software Program.