For whatever reason, the download center pages are a little slow to update this evening, but the file downloads are technically live and Microsoft docs is even showing the updates under "What's New". The blog post with more details will be live in the morning, but if for some reason the download center pages aren't live soon, I'll post the individual file download links here.
With over three hours to spare
Power BI Report Server (August 2018) : https://www.microsoft.com/download/details.aspx?id=57270
Blogpost coming in the morning!