Did a google search and found this on another forum. This is an official reply from Garmin to a request for information on the Zumo 660
If you go here:
http://www.garmin.com/garmin/cms/site/us/ontheroad you will see a Zumo 660 so I asked about it. Here is what Garmin said:
Dear Indytriker,
Thank you for contacting Garmin International.
Unfortunately at this time, there is no information posted for the Zumo 660. As this unit was pushed to the Garmin website prematurely, we do not have a target release date for this product, or know any of the specs and or features that this new Zumo will have. Please continue to visit the website in the future to see what this unit will have that the current Zumo 550 does not have.
With Best Regards,
Sean Mc
Product Support Specialist
Automotive Team
Garmin International
913-397-8200
800-800-1020
913-440-8280 (fax) Attn: Sean Mc