Tomorrow is pokemon s&m 30 min gameplay, wednesday pokemon go q&a and thursday pokemon special
receipts? It's a possible expectation but it's never been confirmed or even hinted; as far as I can see. We had 20 minutes of Super Mystery Dungeon last year. What we've been told is we're getting "new information and developers' stories"
It's just a nomral treehouse live stream so you'll probably be able to watch it on the Nintendo Youtube channel of the official Nintendo website. Maybe even twitch.