Although I agree it is just a sales tactic (I get these in the mail constantly) - if they are looking for business enough to call you, you are in a lease, and you want to stay in a new m3 longer they may be willing to deal. If they buyout the old lease and get you in a new one now without any costs, why not?
That should be just about enough time for all the kinks to get worked out of the new m4.
