Earlier this week, Head of the Windows Program Dona Sarkar teased that Fast Ring Insiders could get new builds to play with today, but this is unfortunately not going to happen: Sarkar tweeted a few hours ago that the team has just discovered a rollback bug with their build candidate, so the Windows team needs a bit more time to analyze data. The exec added in a second tweet that they should decide what to do tomorrow at 10AM PDT.
#WindowsInsiders we've hit a rollback bug with our build candidate. Keeping en eye on more data so no Fast Ring build release today
— Dona Sarkar (@donasarkar) August 16, 2017
Last week, the Windows Insider team did not release a new PC build due to a bug causing a "big impact," but Mobile users did get the preview build 15240, which was unexpected. Sarkar didn't say anything about mobile in her tweets today, so it's probably better not to expect a repetition of last week's scenario.