Yes, that would be a hint......so would the fact that in another pic the title on the slate has been blurred out.....
As for the actor playing Vader, we had a gentleman from Ottawa (I'm in Montreal) who impersonates Vader, owns his own screen accurate costume....so that base was already covered. I only had to give very basic direction (as what we shot was exceedingly simplistic).
And we're saving the singing Christopher Lee for episode II.