Could it be fake? Yeah. But it's making the net rounds and it but matches up wit a description that leaked a few weeks ago.
Cate, Shia, Jim are all refered to by their actors names not character:
Lucasfilm Logo
Paramount Logo
Black screen
We hear a low buzzing
Shot of a mass of big jeeps crossing the desert
Fade to black
JIM BROADBENT: There are many secrets in this world...
Shot of a wooden box being loaded onto a loader
fade to black
JIM BROADBENT: ..that man was not meant to discover...
Shot of the Ark being lifted out of its confinds as govt. scientists watch in awe.
fade to black
A shot of the lid being lifted off the ark
cut to black
Cut to Indy and Jim in a university hallway
JIM BROADBENT: There are others who seek the power of the ark now...
cut to black
Shot of Indy leaving the university, looks like he's being watched
Shot a woman in a white dress stepping from a vehicle
CATE: Your services are required Dr Jones.
Shot of Cate talking to Indy, she opens a box revealing a Crystal skull
INDIANA: I'm sorry I can't help you.
Shot of Marion tied up in the back of a vehicle kickin and screaming. The door opens and Indy reacts.
CATE: Your reward...is her life.
INDIANA: Marion!
Shot of a ship crossing the ocean
Massive shot of Indy and Ray Winstone in a temple
Shot of Shia fighing next to rotating blades
Shot of a huge Mayan city
Shot of Indy racing through catacombs
Shot of Cate slapping Marion, Marion slaps her back.
Shot of Cate by the crystal skull alter, a fleet of soldier behind her, we can just see the ark, she places a crystal skull down
Shot of Jim Broadbent looking very worried.
Shot of A Mayan temple exploding with the power of the Ark
Shot of Indy and Shia swinging across A huge ravine walls collapsing around them. Shia slips at the edge. Indy grabs his Hand.
TITLES: INDIANA JONES AND THE KINGDOM OF THE CRYSTAL SKULL
Shot of Marion punching Indy
INDY: I should have seen that coming
2008
