It's also been 2 years for us ... some of the things I've come across:
FastPass booking opens at 7 am EST instead of midnight
Frozen Ever After new and a Tier 1 FP option at Epcot, very popular
Pandora has introduced tiers at AK in that you can only book one or the other of new rides
Rivers of Light is new nighttime show at AK
No longer a nighttime parade at MK
Wishes is ending in May, new fireworks show is called Happily Ever After
Sum of All Thrills in Innoventions at Epcot is closed; Stormstruck as well
Disney Visa character meet and greet has moved from Innoventions to nearby Figment
Disney Visa character meet and greet offered at DHS
Soarin has updated movie and third theather added
Anna and Elsa now meet at Epcot not MK
Magic Band 2.0 is redesigned band; Purple now a color option
Disney Springs has opened many additional stores and restaurants
New family raft ride at Typhoon Lagoon
Shark Reef has closed at Typhoon Lagoon
Disney resort guests no longer charged a towel rental fee at water parks, show Magic Band
Preferred parking now an option at the parks for paying guests (additional $20 fee)
New Muppets Present ... Great Moments in American History show in Liberty Square at MK
New Skipper Canteen restaurant at MK
New Star Wars fireworks show at DHS
Third track added to Toy Story Mania
Sounds Like Summer concert series at Epcot cancelled
Tickets now have an "expiration" if not used by date, will only be value paid toward purchase of future ticket
Water park fun and more no longer sold, "option plus" only available with purchase of park hopper
Disney Quest will close July 2
Stitch's Great Escape seasonal operation
Lights, Motors, Action & Honey I Shrunk the Kids playground closed at DHS
Additionally, menu changes, renovations, updated tours, meet & greets and such.