So, to summarize the details:
-Microsoft would potentially release Game Pass on Switch through their upcoming xCloud streaming service.
-Microsoft might publish some of their first party titles that make sense like Ori and the Blind Forest on Switch via ports.
-Announcement could come as soon as this year
-No details yet on rather Nintendo might return the favor by releasing some of their games on Xbox, though considering other recent rumors of a big Microsoft-Nintendo partnership next-gen, it is a possibility.
I really don't want Nintendo releasing their games on Xbox. Microsoft already turned Banjo-Kazooie into an empty vehicle building game, who's to say they won't turn Mario into the next Gears of War?