Tomorrow (Thursday, June 28th) we'll be upgrading Manuscript. We will be deploying files and upgrading accounts gradually throughout the scheduled maintenance window. Each user will experience an automatic refresh when their site is upgraded, and we do not anticipate any downtime during this or any other time during the release.
Here's a link to the release notes
on our help site
. And of course, as always, don't hesitate to get in touch
with questions or feedback.