XenForo 1.3 released its first beta this tuesday and as of today there is only one bug pending to be fixed. This makes me think that next tuesday we could see RC or the last Beta in the worst scenario. So it's safe to say that XenForo 1.3 will be released in february.
Well, now the discussion is about the next version which is going to be XenForo 1.4. I like the approach that @Mike and @Kier are having of releasing new feature releases quickly instead of waiting a lot of time for a new version to be released (see here).
So when do you guys think that we will start seeing the first HYS for 1.4?