What month do Honda / Acura navigation DVD's get updated?
 

I have a 2005 Honda Navigation DVD (orange v3.4, I think) in the
factory system in my 2005 Accord.

I am looking for updated road maps, and tested in a dealership that the
2006 DVD has some major highway revisions in my area (Boston), but not
all of them.

I am debating on whether to wait for 2007 or not, in hopes of getting
most of the major highway revisions (construction was mostly completed
by early 2006). Does anyone know approximately what month the update
comes out? Also, how long does it take to filter to new dealership
cars, so I can test out the maps?

-MVL