Sounds good. I really think this E3 could be one that delivers.
Some things of note:
A lot of people have been guessing the XBO wold get a UI update revealed at E3 so seeing a "system update demo" listed is nice.
Also, one thing to keep in mind with lists like this is how liberal outlets can be with the word "unannounced." A lot of the time it's stuff we know it's just the game hasn't gotten a big blowout yet -- which is fine, I'm just saying these 20 aren't likely to be all brand new. For instance, I definitely would expect Mario Maker to be one of the Nintendo games but they just listed it as "Nintendo Game" as opposed to calling it Mario Maker so of course every game isn't something never before seen.