Yamaha is historically very conservative, so I can't see them doing anything factory turbo'd. They've been DEEP into the 4 stroke sled world for 10 years now with rock solid motors that have a HUGE aftermarket turbo following but still do not offer a factory turbo setup, they are partnered with a company who supplies them aftermarket that they will still honor warranty with, but nothing factory direct. To me, this new motor shows some similarities to 3 450 cylds married together, which seems crazy, but they already have 2 250 cylds married together that makeup the Phazer motor. They already have a 3 cyld CVT drive motor that makes 130na hp but is pretty damn heavy. If this is something similar to a mated 450 setup it would be lighter with similar hp numbers, but IMO reliability issues will result, and furthermore an aftermarket boost setup will really test the limits of reliable performance. BUT.......... only time will tell. What you can count on is the fit/finish/quality to be far superior to the other options out there!
Side note..... I've heard rumor of paddle shifter, but haven't quite grasped that thought yet. Also, if they are going factory turbo, just how far will they take it? Their factory supported snomo turbo makes 190hp on a 130hp na motor. We can only speculate that any triple would be in the neighborhood of 1k cc which by rights with the current technology should make similar na power. Could we see a 200hp SxS out of the yammi camp??