The most recent video of the game showed what appeared to be co-op gameplay.

Here is a link confirming and some details.

It doesn't confirm that the co-op is  what the Wi-Fi logo on the box was refering to, but if this game has a strong online co-op mode that  will make the game a lot more tempting.

- multiplayer stages are unlocked by finding secret rings throughout the main game
- after that, select multiplayer from the main menu
- play as Robo-Sonics in multiplayer
- co-op Eggman-designed simulation
- levels specifically designed for two players
- combine color abilities
- hidden secrets
- offers a rather tough challenge
- pulley systems that require both players to air dash into each other over and over to move upward
- you must cooperate during certain sections to progress
- find blocks guarding rings
- the goal can be destroyed after extended drilling on some occasions
- combine laser and drill at the same time to create an extremely powerful drill
- 6 tiers of three levels each
- multiple colors combinations

*orgasm*

Ok... so this just shot up to my top 3 games i'm waiting this holiday season :D

Yeah, this looks like it will be great.

In other news, Sonic 4 is a slight letdown...it plays alright but it doesn't have the same...oh, oops, I've said too much.

Rather what i imagined, at any rate. A solid platformer, but not spectacular.

Pretty muhc sums it up. They were going for a 7.5 review score...unless the delay Sega put on the game changes something drastically.

Sonic Colors best Sonic game in years?

Everytime they release a sonic game I wish it's gone be a good game....I was wrong with Secret Ring, Black Knight and Unleashed. This one better be good or I stop loving Sonic. I think this looks good but I won't buy this game on street date IM gone wait for a couple of reviews and maybe rent it.

For now the only sonic game I play are Sonic all-stars racing and Sonic rush.