Fortnine out of Canada did a great forward looking review of the Niken that looks at the strategic reasons as to why Yamaha is putting so much effort into the three wheel tech.
Additionally Yamaha bought the patents for this:
Yamaha Has Patented a New TMAX Tilting Trike
More Three-Wheelers for Yamaha The Yamaha Niken is a funky machine...
And are applying the tech to electric scooters as well.
TRITOWN - Yamaha Motor Design | Yamaha Motor Co., Ltd.
Introducing the TRITOWN, an electric vehicle to make last-mile personal...