Gonna lay out my straight up prediction to see how close I get...
I think we'll get the name of the console, we'll get a quick showing of the basic portable and home console features it has, such as someone taking the unit out into the world and then back to the home with ease, and that's mostly it. I don't think we'll get games other than Breath of the Wild, though maybe some CG stuff to simulate a Mario or just Nintendo characters in general, but I think they'll wait for the full reveal to announce games and all the other details like pricing. Of which at the end, I think we'll get the announcement for next week where they'll do either a Direct or a surprise event.