From the videos I've watched it appears the only difference is the 3 position switch which has the new "sport mode" as one of the three selection choices.
What about the Inspire 1 remote ? Will this one work with the P4 ?
I'm going to edit my posts, I was just informed that ALL the P3 Pro/Adv and Inspire remotes will work, they may just require them being updated to the latest firmware.