I heard through the grapevines that this was supposed to be announced "any time now" (sorry for the vagueness).
Anyway, I hope that Microsoft understand the situation they put their customers and partners in with such lack of information / roadmap.
We cannot make business decisions, let alone sell solutions to customers, if we don't have some sort of roadmap. The way I see it, Power BI Embedded is "forbidden" territory until this problem is resolved. This also impact other areas of Power BI. Just take a look at uservoice.powerbi.com and look at all feedback that is marked as "planned" that we have no idea when will be ready (sometimes even "started" is an issue).
Although we the community love Power BI and are always enthusiastic to see what's new, customers are (most likely) not as passionate as we are. They want roadmaps, timeline, and fully implemented functionality.