Not worried about Sony's one-year head start
Because of that power gap, Penello said Microsoft isn't especially worried about the one-year head start that the PS4 Pro will have on Scorpio. When asked about a more concrete release date, Penello reiterated the holiday 2017 timetable that Xbox head Phil Spencer announced at E3 2016.
"We announced this year to give developers more time to familiarize themselves with the hardware," Penello said. When asked if the work developers are doing on the PS4 Pro now will benefit Scorpio when it launches next year, Penello responded that he hoped so. "It's interesting that we've arrived in a similar place," Penello said, referring to Microsoft and Sony. "The PlayStation 4 Pro gives developers a road map for 4K gaming."
http://www.polygon.com/2016/9/7/12841596/microsoft-xbox-scorpio-playstation-4-ps4-pro-more-powerful