PocketPt.net has gotten their hands on a copy of the 2007 i-mate roadmap. The PDF document (with a copyright date of 2006) shows the Ultimate lineup coming out mostly in July except for one model slated in April. The presentation also reveals details about i-mate devices that I had not heard about before, namely the Odyssey and X-Series (consisting of four devices).
Note: The ‘More information’ link will open a PDF document (as long as it remains available).
Source: PocketPC Thoughts