The temple hasn't had an upgrade since global. This could easily be added as part of an atomic age temple upgrade, and then it is available to most players.
There is no way they will add something this important and then hide it behind an upgrade to cold war - I bet it either gets added at atomic, or stays out of the temple completely.
There is no way they will add something this important and then hide it behind an upgrade to cold war - I bet it either gets added at atomic, or stays out of the temple completely.