The drink has yet to be officially acknowledged by Starbucks, but several of the posts imply it will be available at the end of the May (both May 30 and May 31 have been floated as possible release dates). We've reached out to the company for comment, and will update with any official word. Hopefully, it isn't such a pain in the ass to make as to trigger any barista breakdowns.
Of course, if this Ombré concoction never comes to pass, there's an extensive secret drink menu full of wondrous unofficial offerings to ponder. Or... not.