Well according to the Google article I'd found to break the news of v6
http://www.gpspassion.com/fr/comments.asp?id=463 ;-) they do have USA maps now.
The biggest problem with Alturion is that it is very very lacking when it comes to usability and it keeps amazing me that they insist on having a PocketPC run an app that a laptop can barely power! Each time a new version comes out, I try it in earnest (3, 4, 5, 5.3, etc...), but sadly the total absence of mobile optimization remains.