So the guide lines are pretty simple. If it hasn't aired as part of an episode, which does NOT include sneak peaks for next week, it's off limits, unless you spoiler tag it. Or you can talk about it freely in the Walking Dead Spoiler thread if you think it's going to start a rather long conversation.
Speculation on what might happen in the series is fine. Just keep in mind Comic book info, articles from interviews or any other information out there about the series is off limits.
I for one am looking forward to next season, even though this past season was a bit hit or miss for me. I can't wait to find out more about the character with the chained zombies, and I hope to hell Lori and her son die soon, (highly doubtful) I hate them so much! Stupid useless characters.