You can get $150 max off right now booking through Cheaptickets or Orbitz, and still have free cancellation. See Mousesavers to get the respective codes.
Some report that booking through a 3rd party site will get you the bottom of the list when it comes to room requests and upgrades. I've had success with both, but I think it's more a matter of occupancy.
For possible Disney specials, I would only expect a promo if staying Sun to Thursday. And even then I think this year chances are slim depending on how Star Wars goes.
Thank you... I will check those out. I knew that Star Wars was going to cause an increase, but got a bit of sticker shock when four nights came out to be much, much more expensive than in 2014 for six nights.