The idea of a January reveal makes sense to me for three reasons:
First, it's big news for the company's early Feb quarterly investor meeting. The next one won't be until May and Furukawa already confirmed we'd see it by March.
Second, it sets up a commercial for the Super Bowl for the mainstream audience, same as last time.
And lastly, my personal prediction is that the Switch 2 trailer will reveal Monster Hunter Wilds coming to the system, effectively getting ahead of the game's release on the Playstation 5 in Japan.