So a new Sonic game leak from Midori that's also backed up by info from Sonic Team's director about different characters and storylines he wants to include in his next title. He gave a ton of details that show a really good picture of what this game will be.
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Yes all the characters ARE present in the video and seemingly in this new game, as well as a bunch others.

Chapters
00:00 Opening
01:05 Midori
02:35 Sonic's Model
03:29 Whether 2D Gameplay Will Return
04:51 Blaze the Cat Two Mentions
06:51 Change in Direction for Sonic
08:09 Non-Open Zone Games Soon
09:29 Infinite & Mephilis
10:17 Return to No Boost
11:38 All Original Stages
12:25 Sonamy
13:12 Metal Sonic
14:12 Sega to bring back Bark
15:11 Knuckles Watch Party