Adventure Mountain really looks great!
A lot of smaller things were done to the park as well that make it much better. The exhibition hall (next to Daredevil Falls) is now "Hall of Memories" which has memorabilia from the parks 25 year history, including vehicles/cars from past rides such as Thunder Express and the Flooded Mine, and a lot of other cool things to look at for those theme park history buffs including a time line that compares what was happening in the world at the time of each Dollywood addition. You can also get your photo taken with a digital version of Dolly in the Hall of Memories. Dolly's Closet got remodeled. Friendship Gardens as been reworked so Showstreet does not have the bottleneck effect that it use to have during festivals. According to Dollywood's Facebook page
the DIY network show "King of Dirt" worked with the park to remodel the flower bed and will air on the DIY Network May 9th at 9 p.m. eastern. The Dollywood Emporium has lowered its shelves, painted, and moved and remodeled things. Just a TON of small things that really make the experience better.
Also according to local tv stations and papers the Hallmark Channel will be shooting a 25th Anniversary special at the park that will include Dolly, Kenny Rogers, Billy Ray Cyrus, and Miley Cyrus. Dolly will be filming her last appearance in April for Hannah Montanan's final season which she announced opening weekend along with promoting the new "Dollywood Vacations" brand and stating that the park will still be doing a resort and spa in the future (that she announced was in the '20 year plan' in 2005) but will still be holding off for a bit.
A lot of Video, audio, and pictures can be found of opening weekend here: http://www.dollymania.net/wood10-a.html
Dollywood also announced via Facebook
that the 3rd annual "Thrills in the Hills" event is now open for online registration and if you register by April 16th you get free parking for the weekend. Link to event: http://dollywood.com/dollywood-q10222-c10214-Thrills_in_the_Hills.aspx
*EDIT: One thing I forgot to mention that you theme park memorabilia collectors may love, you will notice new banners hanging on the light posts this year featuring this years theme "Celebrate The Dreamer In You!" with the logo, and Dolly Parton. They have the same banners for sale at Dolly's Closet for $50 (they are double sided) and you can get your Gold Season Pass discount on them which is $10 off...they were selling pretty good opening weekend...I've already got one hanging in my room.