Sonic & All-Stars Racing Transformed

[NICKtendo DS]

So Metal will only be available via DLC or in the special version, right? Is that version out yet?

The Limited/Bonus Edition (it includes a unique DLC code in the box) is the first edition to come out. It's basically an insentive for people to pre-order the game. As far as I know, the normal edition has yet to come out.
Also, unless I'm mistaking, the WiiU version is the Bonus Edition by default. Metal Sonic and OutRun Bay are on the disc itself.
There has been no straight answer as to whether Metal and OutRun Bay will be offered as paid DLC in the future, but it'd be weird if it wouldn't be the case.