Yes, classic Sonic is using Mania styled S3&K sprites

stuff

boost mechanic

Teaser. Just started this today. #CodenameSCA

I LOVE R I N G S

early character select screen

New art.

Play ultra here until the final release: https://scratch.mit.edu/projects/325687000/

So, a new build of sunshine was to be released today but it is going to be delayed for about a couple of days.

Turn it up, get down! (Not an actual screenshot, just a teaser.)