Before the first round of Jakks Pacific Articulated Action Figures even appeared in stores, these photos shows up of more of them.
So, they will add Knuckles and a large green super emerald (probably not the master, as that is larger than the character), Metal Sonic with an Eggman symbol tile, Sonic again, but this time with a snow board accessory, & Tails who has a speed boost accessory.
The Tails is essentially the most similar one as the only difference is what is inside the power up globe. Sonic is basically the same too, but the snowboard is fun. (Note his hands are position reversed too)
Knuckles looks good, as expected. The fists are good/big, and the knuckle spikes seem especially big/they didn't skimp on them/the design. His body is also a different shape than Sonic's, which is good to see as well. His expression seems ok. The emerald being flat on the bottom is so it'll stand up...which is probably ok too even if less accurate.
Metal Sonic looks like he is having a conversation about something. His hands are (by default) the most detailed by far, but they're also posed in the most detailed way. What's disapointing about him is that where is the METALLIC paint? Jakks Pacific owns shiny paint & uses it on other figures but he just looks wrong/boring without it, so why are they not using it? Hopefully the final figure gets real metallic look. He comes with an "Eggman Tile", but what it is, is an "Egg Spring" which is an unfortunately placed spring (that Eggman pu there) to knock Sonic into a trap and it appeared in Unleashed, Colors & Generations. It's nice looking, with raised center detail & good stamp.