On https://wiki.samba.org/index.php/Installing_RSAT_on_Windows_for_AD_Management, there is a claim that the RSAT release for Windows 10 is "scheduled for August 2016". That should be August 2015 per the linked source. Sorry for the bug report, I would have fixed it myself, if I could have registered an account.
Seems to be fixed now. Closing out bug report. Thanks!