Here. As far as we're aware, this is the first time the game's been confirmed and given a solid title. It's been known for a while it was coming thanks to an ERSB rating. IGN's describing it thus: "Mr. Driller returns to drill down to the underground and save the day in this action puzzler for the XBLA."
No release date as yet.
Update: Details here. It's "spring" in Japan.