What I'm working on now - I'm back to fantasy although considering that it's me I'm turning it into a kind of science fantasy. It's a vampire story - but my vampires are biological vampires. They didn't become vampires because someone bit them they were born that way.
I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.