The current Pro Nav system works very well with the IDrive. I have found it very responsive and easy to use. I recently went on a drive where 3 others Ipods were connected during the trip.
The system recognised each of them imediately and showed all their functions instantaniously.
I am not sure what advancements a new system offers but this one works very well.
I have been told it is fully upgradable, so it should be able to have new functions added.