He's still looking a bit pink.
Today Sega released more gameplay of Flying Battery Zone and this time we're able to see Knuckles peruse through Flying Battery in a 1 minute video shown below (plus screenshots including Sonic and Tails).
Fri Apr 26, 2024 | 2 d
Wed May 1, 2024 | 7 d
Wed May 29, 2024 | 35 d
Wed Jun 5, 2024 | 42 d
Autumn 2024 | TBA
Fri Dec 20, 2024 | 240 d