Scientists suspect radiation (some math indicates it's existence) from black holes, this travelling backwards in time, faster than the speed of light. Also a recent Scientific American article spoke about some evidence for superluminal gravity particles (gravitons) whose propogation speed is manny many times that of light.
I cannot remember the issue or title of the article but I will try and find it and post it here.
I don't think there is any reason to believe any more (even in the constraints of conventional science), that there is nothing that travels faster than light. The situation is that in certain frames of reference superluminal speeds are impossible, in others it is possible. Science will find the means to manipulate gravity in order to place individuals artificially in frames of reference that are not subject to those conventional "rules". For example, John Titors Twin Singularity (if true, I am as yet undecided, yes despite the "photographic" evidence - I can still find justifications on either side of that argument).
We may as the human race evolves develop a spiritual ability to change our frame of reference, without the use of technology, and experience the universe without being limited to space/time (out of body exerience?) but modern physics, let alone Natural Science, doesn't even touch on this (yet!)