https://www.youtube.com/watch?v=PS04ETQfTKA&feature=push-u&attr_tag=RhuW5nHTL00-6
Captured by phone screen-shot from BlueParadox, he takes pictures based on screen shots from Sonic Mania given to PlayStation Magazine. They show off announced zones but we get a first look at Green Hill Act 2. Sonic is holding on to a zip-line as Tails follows him from behind, confirming Sonic & Tails mode from Sonic 3 & Knuckles returns in Mania.
But the zip-line was a mechanic used in Sonic 3, indicating that more elements from Classic Sonic games are present in Mania.