Until a new manager is assigned, Fin William will act in that position.
I am not going out unless it stops raining. (not unless it will stop)
Providing the weather is good, we are going to have a picnic. (not providing it will be good)
unless, as long as provided/providing if unless when in case until as long as so long as provided (that) providing (that) etc 節内はwillを使わない。 現在形で表現する。