Phil Spencer announced today that Project Scorpio will get it's full reveal at E3 this year. This little tidbit came near the end of a long posting by Spencer via the Xbox Newswire highlighting how proud he is of the project and the team behind the project.
I’m proud of the progress made with Project Scorpio and what it will mean for the creators who fuel the passion of gamers around the world. On behalf of everyone at Team Xbox, thank you for your continued passion and support. We’re excited to unveil Project Scorpio and the amazing game experiences it powers at E3 this June.

E3 2017 runs from June 13-15. Microsoft's E3 press briefing is scheduled for June 11 at 2PM (PT).