I am trying to understand Elder Oaks' talk. Taking everything he said at face value, here is what I think he said:
1. Women don't hold the priesthood.
2. Those who hold "keys" can give assignments to others who then act under the authority of the priesthood of the key-holder.
3. In the temple sisters use the authority of the priesthood to perform washings and anointings, inasmuch as they were set apart by key-holders.
4. Therefore women use the authority of the priesthood.
From this it can be surmised: Sister missionaries will be able to baptize some day using the authority of the priesthood of a key-holder. This talk was designed to accomplish what the "Ordain Women" movement wants by approaching it in two steps rather than one. It is de facto ordination, incrementally adopted by careful measures.