Here's the description straight from YCG as well, just in case anyone has any...aversion to watching the video but wants to know the details:
Cooperative Multiplayer (exclusive to Wii U)!
- Join a friend’s Shovel Knight campaign and shovel together!
- Use new cooperative moves to help each other out along the way!
Deep Customization!
- Level up by defeating enemies and finding treasure!
- Earn all-new relics, abilities, and powers you never thought possible!
- Customize the look of your Shovel Knight with cool and crazy cosmetic options!
- Use your custom amiibo seamlessly between 3DS and Wii U!
Exclusive Challenge Stages!
- Battle your way through amiibo exclusive challenge stages that take advantage of the new amiibo relics and abilities!
One amiibo, multiple games
- We plan to continue support of the Shovel Knight amiibo in future Yacht Club Games and Nintendo products! Stay tuned to amiibo.com for compatibility details in new games.
I definitely want to pick one up, especially since it's compatible with 3DS and it'll be a whole hell of a lot more useful than the Samus one I was thinking of getting awhile back considering I don't plan on getting Smash
