I can't believe so many people are falling for this word-of-mouth Hollywood mindgame.
Whatever the movie is, I can tell you one thing - it's not worth the effort people are putting into trying to figure out what it is. They only do this to get people curious, so that they'll confuse "being curious about a movie" with "thinking the movie looks good".
they tried to do the same thing with Titan A.E. - with a stupid trailer and marketing campaign that showed you next to nothing. But it backfired and nobody saw the film and it bankrupted the animation company that produced it... and, oh yeah, the movie sucked ass.
by this time next year everyone will be looking back and saying "man, I can't believe I was so excited for this movie when that freaky trailer came out... all of that excitement and it just turned out to be some stupid *blank* movie..."
...
It reminds me of that commercial for "Gabbo" in the Simpsons, anyone remember that? The commercial is just an announcer saying "Gabbo, Gabbo, Gabbo!" - nobody knows what it is, or what it's about, but everybody loves it for some reason...
... then they find out it's a puppet...
WAIT! I GOT IT!
"Cloverfield" is actually "Gabbo: The Movie"!!!