User blog:PrinceGoldenGale/Rovio has spilled the beans

It looks like they are redesigning the game package. On previous versions there are only a few files that we are able to actually use.

They are and nothing else. If you want other than these files, good luck because those are scripts for the game.
 * Music files (96Hz quality)
 * OpenSans and AngryBirdsTxt.tff

Now we are able to get behind the scenes, there are

audio folder: images folder: There is a problem now. Those pictures are not jpg friendly. These pictures are in webp file extension. You have to come up a way for this.
 * Upgraded quality music
 * In game SFX
 * Birds' voices
 * wp (left menu)
 * tutorial (tutorial images)
 * other (there is Red and Chuck join the flock image)
 * login (art menu)
 * intro (pre level screen icons)
 * gates (map icons)