Omg. Okay, I'll explain this as calmly and clearly as possible...
So...
Soraya Saga has a history of retweeting Nintendo Directs before the event happens. Turns out that every time she retweets the announcement (whether it's a day or the week before), news of Monolith Soft's game occurs at the event.
I have gathered info that she retweeted the following events, all of which Xenoblade Chronicles X made an appearance:
-Wii U Direct on January 23, 2013
-Nintendo Direct @ E3 2013
-E3 Digital Event 2014
-Nintendo Direct (November 5, 2015)
Based on Soraya Saga's history and looking at her latest retweets (NCL, NoA, & NoE) of the Switch Presentation, there's a possibility that Monolith Soft will be presenting their next project at the event!