I've seen trailers for things like Melancholia (which I fancy), which seems to riff on the same idea. But this seems to be so close that I wonder if they aren't going to end up taken to court over it:
As I like both Steve Carell and Kiera Knightley, I'm still rather tempted though.
*Who loves Callum Keith Rennie, Don McKellar, and canadian film/TV in general.
**Presumably for Canadians.
Original post on Dreamwidth - there are comments there.