Remake of The Day The Earth Stood Still, with Keanu Reeves as the visiting alien Klaatu:

Possible changes I can see from the trailer:

1951: Communist paranoia abounds as a “stranger comes to town”
2008: Al Gore paranoia when Earth becomes a eaten(?) turned into(?) a dustbowl

1951: Klaatu is Jesus – his psuedoname is “Mr Carpenter”
2008: Klaatu is a robot – he barely blinks. Whoa.

1951: Gort is actually in control and runs the show.
2008: Gort is directing and steals the show.