You get an option I think if you want to work for A380 or main fleet (B777/A330/A340). When I joined there was no A380 so we were working on main fleet and had to apply to work on the A380 once it arrived but with the new crew coming in I think you have a choice- there was some rumors that they need a lot of crew on A380 so assign crew to work on certain fleets with no choice and on a later stage have an option to move from fleets.
Hope this helps a bit. In regards to destinations, well that you can look up on the website.
Take care