There's no plan currently to port Eps 1-4 to Unity. Sorry to disappoint some of you with that, but as some others have pointed out the amount of work would be far too great to get that done, much less to add anything new to them. We would need to recreate all of the programming from scratch, and possibly more than just that--some graphics and animations would also need to be redone. The team just doesn't have the manpower or the time to take that on, especially with Ep 5 still being worked on as it is.