There seems to be a collective scream of "Noooooooo!" on movie sites regarding casting Reeves as the somber alien in this movie, but I actually think he may not be a bad choice. Keanu has always had kind of an otherworldly vibe about him and if he can dial it down he could pull this off. He's certainly played somber characters before.
Now this doesn't mean I'm in favor of a remake of the classic film, which was released in 1951 and directed by Robert Wise. The original was a commentary on the Cold War between the U.S. and Russia and no doubt this one will be about the war on terrorism.
According to Variety it's being called a "re-imagining" instead of a remake, no doubt due to the stigma associated with the latter.
No doubt the character driven, cerebral tone of the original will go by the wayside, giving way to incredible special effects, a heavy-handed "message" and the fact that they'll no doubt work in battle sequences that were nowhere to be seen in the original.
Production is set to begin either late this year or early 2008.