Range is subjective. It really depends on line of sight and interference. For example, if you go to your local outdoor life store and pick up a set of FRS walkie talkies they will say 5 mile range. However, that is under the best of conditions, direct line of site from antenna to antenna significantly away from the ground.
The distance that can be between two Sena units has not changes. That is limited by the amount of power the law allows them to use. Sena introduced mesh networking to help out with that. What that means is as long as you are within range of one person in the group you can talk to and hear everyone in the group. The messages relayed. For example let's say we have three people with the new headsets. 1 is max distance from 2 that can still have a conversation. 2 is also max distance from 3. 1 is out of range from direct contact with 3. So what happens in mesh networking is 1 speaks, 2 will pick it up and rebroadcast, thus 3 will be able to hear what 1 said.
On a related note and why I found this thread, those what have a newer Sena, like the30k, and the app is it possible to use your phone to record the audio?