The speed of light only applies to matter and energy. Space is free to expand at any speed, it does not have any limit (that we know of). Yes there are galaxies beyond the cosmic horizon that are still coming into view. Although since galaxies are hundreds of thousands of light years across, it therefore would take that much time for one to come into view. We don't know how big the universe is but we do know it is at least several times bigger than the observable universe.