No, they did not say what was different. Here is the e-mail I received:
"Dear Dave,
Thank you for your interest in our products.
We are in fact planning on releasing the Topo USA 4.0 within the next 4-6 weeks. Please keep an eye on our website.
Thank you for your inquiry."
Sincerely,
Jonathan Braden
DeLorme Mapping
Yarmouth, Maine
www.DeLorme.com
1-800-561-5105
I'm sooooo glad I e-mailed them before buying v3. Now we'll have to see what's different.