The movie keys are simply battlechests. They do not give time on your current account. It is for the new account and it provides you with all the except legion. The transmogs are for anyone who logs in from now till legion.
Contact me on skype:tom2step, I have a keys for sale for the battle chest which grants you all the WoW games excluding legion, and a free 30 days of WoW time!
Keys are $12 on g2a
EDIT: I'm selling for $4 USD
$4 USD
PAYPAL OR SKRILL
message on skype!