What scenes are going to be in the sequel to The Hobbit from the book ?

Scenes showing:
1. Skin shifter (or shape shifter) who can turn himself in a big bear.
2. Giant spiders attacking them in a forest.
3. They being trapped by Legolas' father, and Bilbo heping them escape from them.
4. Arriving to the mountain were they (or Bilbo) will face Smaug.

Also, Golum following them, and a first look on Legolas.

The spiders in the forest most likely. And Bilbo talking with Smaug.

i think the part where they meet smauge and smauge burns down the town also when thorin dies