There has been much speculation of version 2.0. I believe the iPhone will cause people to rethink what it means to have a "new version" of a cellphone.

Software upgrades to the phone will be very regular imo. I do not think we will see a hardware change for at least a year. In short, version "2.0" will likely be in a week or two. :-)

In regards to 3G.. many are finding that the Safari browser is performing faster on the EDGE network than Treos on 3G. Take a look at comparison videos on YouTube.