Lo and behold. No replies from him.

So I guess he simply had nothing.

Looks like there's no Spin Dash and they're still with the Boost Formula, just in an open world setting.
Which is kind of disappointing because I'm ready to move on from "Boost to Win."
The most promising aspect of this is obviously the open world and the exploration factor.

Kind of mixed, overall.
I'll need to see more elements like the story and soundtrack in order to form a more complete impression.

Those fields look soooo bland and soulless, not a fan of this art-style at all. Level design also looks dull, like they just threw around some Sonic elements (the rails, for example) over those bland fields.

Thinking about it more... I'm just not feeling it. People are comparing it to BOTW, but I think the more apt comparison is Bowser's Fury. It's a sandbox with a bunch of self contained platforming challenges. Which is great for Mario where, in the 3D games at least, exploration and figuring out how to get to a certain point is key. In a Sonic game, I dunno how that fits. Hopefully I'll be surprised, because it does look like they're putting in the effort here, but I still don't see how it all comes together.

I had to ask myself what month it is reading the responses after seeing the video, is it April again? 

This looks trash. 

I hate when they put sonic in a realistic world. Why can't they just stick with a more cartoonish style that fits the characters?

Hoping they reveal something that just blow our f***ing minds soon. Delay is definitely happening, right?

after I watched it I just think they should hand it over to some indie team with three people or something as I'm sure they would do a far better job than sonic team.

I still think it looks good, and after seeing the combat I can't wait to see more. I'm curious about the menu system, abilities, and story.