The best place to get information about future patches to a game is always going to be from the developers. Just go to their website. Some devs use third party sites for support or announcements. Those devs will have links to those places on their site.
If you can't find the information from the developer, how are we supposed to know? We are gamers just like you. We only know what the developers tell us.
You said in a comment that you were looking for specific information that you could not find. That is because that information hasn't been released yet. The only thing known about Patch 1.1 is that it is supposed to include PvP, but who knows if that is the next patch? As expected, I found this on the Blizzard website.
...likely the PvP patch (1.1).