The last Sonic game from Sonic Team was Lost World, and that could've been great if they spent more time on it. I assume they were rushed to release to put some distance between that and the first Boom game a year later. Hopefully Forces is better finished.
Sega has the resources to take their time and make sure every title has a chance to be a home run. If this trailer is saying that they finally realize this and they've adopted it as their new philosophy going forward, that's a great start.