Quick takeaways:
1. Kameos are what we thought they were: Assists. Interesting that each Kameo seems to (if I'm understanding correctly) come with multiple assist move possibilities.
2. Meter system seems back to 3 basic bars
3. Breaker system. Seemed like the breaker was tied into the Kameo, but I couldn't tell if that was a specific Kameo move, and whether it cost bar or just cost Kameo meter. I'll need to re-watch.
4. Characters can be on both rosters, so being a Kameo doesn't exclude someone from being on the Main roster.
5. Graphics seemed a bit off to me, but I usually don't care about graphics in this early of a build, and eventually it'll be what it'll be. SFVI had the same thing for me, I'm still adjusting to how that game looks. Not good or bad, just an adjustment.
6. Pace of the game still feels similar to MK11. This could be a total nonsense sentence, and I don't even know if you can judge pace by this kind of trailer, but that's the first impression I get.