[Vampyr]

a) They probably already have these.
b) Out of all these listed, I think transporters are the furthest away from being achieved. It just seems so impossible to teleport humans.
c) Not as impossible to make as you might think...Of course they wouldnt do us any good without jedi powers. Im not sure how they would make one, but I dont think its impossible. The only way they would ever be of any use would be if Mechs are some day invented...
d) I think this is probably in the near future.