Steve, here's what I've found.Garmin is showing a New MapSource CD on their web site but there is no date associated with this. It is also priced at $99.00.
To be frank, there are so many maps, software and the like that it is getting confusing for me to keep my 2007 Zumo up to date.
Goto Garmin site and choose <maps><buy maps>
Go through the routine of telling them which Garmin you own, etc.
When the next page comes up, select the 'View Map' tab. That will bring up detailed maps and you will see the version number at the top.
Also, I've noticed in the past, that Garmin will release new maps in April or May, but they will not be available to buy until June.