A sneak peak of the new design and a little something:

VJ Stellar Golden now reminds more of Super Sonic.
Having orangish-red pupils, no robotic legs, not having pitch-black sclera
(He's still evil and yes, Golden is possessed by the soul of Dr. Eggman),
(However, when VJSG enters his true evil mode, his eyes change
just like the others, when they enter their evil mode)
no dripping cloning material from his eyes,
(P.S. When the clone enters the evil mode, something else leaks from the eyes,
it's called: Enhancer Substance)
although there are no raised up quills... but he can have them in some circumstance.
Overall in this (normally a Skin) appearance, he's more mended, than his default/primary look: Dr. Golden "Prepare-Up!"

The new Character is normally a Skin for Shadow Sonic "Midnight-Up!" also the fact, that he's not the same Shadow Sonic, although Reverie Stellar Shadow Sonic represents the mysterious hedgehog in this "other side swap" version.

Spoiler Alert and Fun Fact:
The most important feature is that, he is not possessed by the soul of Dr. Eggman.
This version of Shadow Sonic is not from the line of Golden Sonic (related to VJ Stellar Golden), but from the line of original clone Azure/Blue Sonic, that is Anew Stellar Sonic.

And here it's the same as in similarity of Super Sonic. It's a form resembling of Dark Sonic.
He does not have raised up quills, but may have them under certain circumstance.

I won't answer the questions to avoid more spoilers. Thank you for reading.