The new i-Pilot remote is compatible with the current controller (head unit). I ran this configuration for a couple weeks this fall before replacing my controller with the updated one, and the new remote + old head unit combo works just fine. Under these conditions, however, you will still be limited to the original set of 3 spot lock locations and 3 recorded tracks. Nevertheless, you'll enjoy all of the benefits of the new remote, which are definitely worth the investment.

You can learn more about the new remote, and the new system as a whole, from the articles at the link below:

The updated MinnKota i-Pilot for 2012