They do although that's more a Microsoft thing than an Xbox thing. I expect something to be shown, but hololens isn't going to be their VR kit. It would be to expensive to battle with psvr, Vibe, Occulus, etc.
A game I can't wait to see more of is far cry 5. That and AC will be my only reason to sit through Aisha Tyler's MCing.
I enjoy the awkwardness of Ubisoft presentations it's apart of the E3 experience.
Also yeah Xbox already have Sony beat with their next Console if the rumored specs are true. Kinda wished Sony would've worked a little more on the PS pro and made it more powerful.