Im sure if you just pay attenetion here someone will post about it as soon as Greg and company release anything new. Im pretty sure they said the next patch will be coming at the end of the year, so pretty much between now and christmas. The "Premium DLC" is suppose to be released at the end of this year too(xmas time most likely), and I cant see them releasing that before they release the next big patch.
Also whats going to be included in the patch should be mulitplayer stuff as the above poster stated, Ai/diplomacy work too.