UPDATE: 2/14/16 The second official trailer has released and shows more background on the plot and gives us a few teases to what lurks around outside. It appears some humans are trying to get inside. Are they civil? Or are they mutated and gone mad? Also, be sure to check out Cloverfield News for up to date info on the viral marketing on the film.
UPDATE: 2/11/16 The viral marketing for the film has begun to ramp up much like the original film. With the latest news on Goodman's character named Howard Stambler. Turns out he is an employee of Targuato Corp. which is connected to Slusho. Follow the link to the Tagruato Corp site to see for yourself.
Also, here is a nice write up of some of the details and secrets discovered from the marketing games. Via slash film.
10 Cloverfield Lane is a "blood relative" to 2008's found-footage hit Cloverfield. Both films are produced by the great J.J. Abrams and, in true J.J. fashion, this film was kept secret and details were under lock and key. Still, that hasn't stopped fans from combing through the first trailer and Super Bowl TV spot for clues about the story and a possible monster in the film.
Check out the first trailer:
And the Super Bowl TV Spot:
Little is know about this film's story and even its location or time period, but through some studying of the film's released footage from the above spot and trailer, I've come up with a possible thread that may hold true.
The Super Bowl Spot gave us a lot of story details that will help this theory out. Starting off: Mary Elizabeth Winstead's character, Michelle, is in a car wreck and is captured, or saved, by John Goodman's character, Howard then secured in his Doomsday Prepper Shelter beneath the surface. It appears that she is there not by her own free will but kept hostage and bound from time to time — as seen by footage of a jail-like room and hand cuffs to secure her. Howard claims that he's preparing for the inevitable, he's the savior of sorts — in his mind at least.
At some point Michelle tries to escape and fails. We know this because we see her smash John with a bottle and book it for the exit. In the same trailer, we see Howard sporting a bandage on his head where the bottle struck. Meaning her attempt to flee was unsuccessful.
Moving on from the escape, we know that Howard has some toxic chemicals kept safe in the shelter, with chemical suits and equipment as well. What is the substance in the barrel? Not sure, but it's likely related to the overall Cloverfield story or lore. Howard in both sets of footage claims that it's not safe outside the shelter.
This is why it's even more worrisome that Michelle would rather escape from Howard's grasp into the mysterious outside world that may have looming monsters. Or is the point that the real monster is Howard, driven crazy and obsessed by the possible threat outside? Perhaps it's possible that the substance in the barrel is not of this world, or created by man turned monster. My only reason for believing this is the end of the TV spot. Around the 0:24 second mark we hear Howard scream, "NOOOO!" At the same exact time we hear a high pitch squeal of some sort. What from? What's that bright light? I believe it's the birth of a hatchling or monster. Pay attention to the final shot of the house and the light. Slo-mo it and you may see something rising out of the light.
In conclusion, my theory is that Howard is the true monster, driven mad by his obsession with the looming threat, or from tampering with the unknown. Or maybe that the threat is born in this cozy shelter, escaping to the outside world. Just remember, "Monsters come in many forms."