During his promotion of Let Me In, Cloverfield director Matt Reeves was recently asked by Collider and MTV if there will ever be a Cloverfield sequel, and he continues to give the same old story: they are still interested in making a sequel... "it's a priority". Just not anytime soon however, as both Reeves' and J.J. Abrams' plates are pretty full right now. Of course, that's exactly what you would expect them to say if they wanted it to be a surprise...!
FYI, Fast forward the video to 12:35 to get to the Cloverfield discussion.
* Thanks to Creative and Markus for emailing this in.