Heros in AB?

Is it possible? I've been waiting with a hero party in Kanaai Canyon for 20 minutes.

Ive heard you can have heroes in AB as a bug but maybe they fixed it or sometimes the map changes and leaves you in the old districts so you have to try changing the district or rejoining from your guild hall. Usually you can tell because no more new people come into your district.

Or everyone is playing nightfall

I'd try reading the alliance battle forums for info on alliance battles.