I have heard that TT7 for symbian (fully supporting internal GPS) and WM is out this month with a few new things unique for these platforms.
While they retain all the functions (bar a few touchscreen only ones for symbian) of the V7 versions already out, you get the following extra:
The ability to call someone and using a hotkey, have tomtom 'speak' to the other person in the call, giving them your location.
A proposed facebook application. Details have not been given to me yet, but its likely its going to be another method of giving people your location, or a destination you want. A bit like Garmins peer points, but much more advanced.
For higher spec smartphones, there is supposedly a google maps type view of going along. I have no screenshots of this yet.
With a 3G connection (or higher) you can connect to a friend with the same version on their phone, and both browse the same map on your screens, and mark things out, add destinations, stop off points, etc.
No price as of yet.