Still there is not any official annoucements regarding the new features or change-logs of this update from the company.
In the latest Play Store update we found that the app got the quick beta tester sign-up feature, which will easily help you to be a part of the beta testing team of Play Services and Gboard.
I have downloaded this APK update and passed it to the Android expert team to findout the new features of this update. I will update this post wih the change-log once we are done with the research.
Below is the APK Update Compatibility Details:
Grab the APK File From the Below link:
Google Play Services v 10.5.35 APK