The more time passes the more i'm starting to think we might see a repeat of what Nintendo did with the Switch 1. So a short reveal video showcasing the features and possibilities of the system with some game footage in October followed by a proper presentation in January, and March being the release. (October really can't come soon enough!)
I don't know how or what kinds of features they could show this time, since the Switch 2 is literally just the same thing with more power, but maybe it will have much more new features or gimmicks that justify one such October reveal video again.
Although like
ReddDreadtheLead said, it might as well just be a deadline for devs & publishers to get their game presentations ready for a Direct or a reveal of some kind.