The Census Bureau organized a webinar on June 23rd for the State Data Centers, the Census Information Centers, and their Data Dissemination Staff focusing on "New American Community Survey Data Products." This webinar provides some additional details about the Supplemental Estimates and Replicate Estimates that will be released on July 21st, as well as a new "Statistical Testing Spreadsheet" designed to help people conduct statistical significant tests with ACS data.
The webinar recording is available here (note that there is a delayed start and the webinar starts at around the 2:00 mark):
https://census.webex.com/census/ldr.php?RCID=bfb97c6495e27093c37b6a8c16f9850f
If you have trouble starting the webinar in Internet Explorer (as I did) you could try Chrome or Firefox as an alternative.
We have also posted a link to the recording on the "Webinars" page in the Online Community:
https://acsdatacommunity.prb.org/p/webinars