This year will be Anime Expo's 20th anniversary!
It will be held from July 1-4 at the Los Angeles Convention Center, you can visit the site here for more information- http://www.anime-expo.org/
Here's what has been announced so far:
-Over $25,000 in cash and prizes for the Masquerade
-Over $10,000 in cash and prizes will be awarded to category winners in the AMV contest
-The world premiere of "LASTEXILE -Fam, The Silver Wing-"
-Anime Expo Dedicates Annual Charity Auction To Japanese Disaster Relief
Guests of Honor:
-Madhouse Studio Creators: Tetsuro Araki, Masayoshi Tanaka, and Kentaro Hashimoto
-President of Good Smile Company, Takanori Aki
-President and Chief Producer of Nitroplus, Takaki Digitarou Kosaka
I will edit this and add to it when more announcements are made.