I might not be well-versed enough with E3, but I'm not totally surprised they didn't have anything new about USUM yet? It seems too early in the process, like we heard about these games very recently. There's barely anything out there yet, and I think Nintendo's main focus right now is heaping as much capital as they can off the success of the Switch, which they're obviously really trying to do with Pokken, as well as other titles. Their market plan is sound and logical, and I don't blame them.
Do wish we knew more about the games though.