PDP has announced recently that they are expanding their selection of wired fight-pads, each stlyed after a different Super Smash Bros. character.
The new additions to the GameCube-stlye controllers are those stlyed after Samus Aran, Link, Donkey Kong, and Wario. The controllers are currently available for pre-order (should drop before the end of the year), and go for $25 each. As their predecessors, these are wired, and officially licensed by Nintendo.
Note that regardless of how they look, these are not GameCube controllers. Technically they’re Classic controllers, as they plug into the bottom of the Wiimote. This is handy, as you do not need the hard-to-find GameCube controller adaptor in order to use them.