There is a video on JW org titled "What happens at a Kingdom Hall?" I wouldn't suggest that you watch it as it's pretty sickly, as usual they are praying on emotions in order to encourage people to attend their Halls.
The video is presented by a female but does show her face. It just seems weird that they have allowed a woman to star in this very prominant role. The subject of the video is directed to non JWs. I guess they see this as a preaching work to the public and not a teaching work to other JWs and therefore is okay for a woman to perform. However, JW org is for both public preaching and personal JW teaching, just as they would recieve in the congregations. The organization is dullying the line between what is now acceptable for a JW female.