It is quite difficult to find the right thing for your PhD thesis. Ideally, it should fascinate you for the next (few) years.
I needed some time to find “the right path” (and still looking out for that) but I think I am now on a very good way. I am thinking about an heutagogical approach for teachers’ education and teachers’ professional development. How is it possible for teachers to foster and facilitate students’ self-directed/self-determined learning with the help of ICT (and without but mostly with – at least I hope so ;)).