Tanks is a battle royal tank game like the one that comes with Wiiplay.
Release notes:
2008/06/28 v0.3a is out, this version is still a POC, but with a lot of bugs fixed and nunchuck support
Thanks to http://www.nintendomax.com for the news.
This article is over 2 years old — the linked page may have changed, moved, or been taken over since then.