Most of I-Drive Live/360 (or whatever they're calling it this week) should be open, including an observation wheel (similar to the London Eye) and a Polercoaster. There's also an Aquarium and a Madam Tussauds, along with (of course) a whole bunch of shops and restaurants.
Universal are adding an unknown ride to IOA - rumours are that it's a King Kong ride.
Sea World reckon they're getting a new whale habitat - not sure when they plan to open it, or even IF they plan to open it given the latest backlash about keeping whales in captivity.
Aquatica just got Breakaway Falls. Very similar to a ride at Wet n Wild.
Epcot are supposed to be doing a Frozen themed ride in Norway. Don't know the details, but Disney never seem to do anything fast so I'm thinking not 2015.
Animal Kingdom is supposed to be getting something to do with Avatar. Again, slow progress. I also heard that Hollywood Studios was doing up its Star Wars section.