Starring "the splendiferous adventurer Ernest Hamilton and his brilliant bird Sasha," Hamilton's Great Adventure is said to offer "both action puzzling and traditional problem solving" and a "fantastical storyline filled with extravagant escapades and memorable characters." Oh, and co-op. Huzzah! It's slated to launch in April.
Hamilton's built upon the BitSquid engine, as was seen in the Stone Giant tech demo.