team weasel: If the information is not in your room, simply call your Front Desk or go to Lobby Concierge (or ask that someone PM the number to you). Posting the number publicly would be a waste of time for DISers and, more importantly, for the CMs fielding the calls - since they will know you are NOT calling from your room or while checked in to your room, and therefore not eligible (not saying the poster who asked will do this, but once a phone number appears, you just KNOW there'll be people who have to try!)
HaleyB: While the room pricing structure is changing next year, information posted by Guests onsite right now indicates that BounceBack Guests must check in by September 27 and are eligible to get the free-or-reduced Dining Plan/s for up to ten nights. This has been true every year the promotion has been offered. Otherwise, a Guest checking in on September 17 could get the promotion for the full ten nights, but a Guest checking in on the 27th could only get it for one night (which, by the way, would violate the 'three night minimum' requirement).
On the other hand, you're likely correct about the rate change. If Regular Season starts (I think) October 2, then Guests who checked in 9/27 for ten nights would pay for eight of those at Value Season rate and the last two at the higher Regular Season rate.
Now, this is an entirely different promotion than your December one, so your savings would be calculated differently - you save $37.99 per person per night, period.