I just got back from Disney World on Monday and the bounce back offer was for a room only discount with a percentage off that varied based on resort level. The discount period was through the end of December 2014 but did not extend into 2015.
For more insight, I was at the AKL during the first week of June in 2013, and at that time, the bounce back offer was the same room only discount with the period available going through the end of December 2013, but not into 2014. So I'd imagine that the offer I saw before I left this past week will be the one that you see in June.
Based on that, I wouldn't make a reservation if the only reason that you are making it is to book a bounce back for 2015. You could post on these forums a week before your trip and ask what the term of the current bounce back offer is at that time, just in case it has changed.