Here are some behind the scenes videos from the finale, they give some insight into what happens in the episode (so if you enjoy speculating this might ruin it for you) and talk about where the characters may go from here. None of it is a spoiler if you have seen the episode, but it does put an end to some of the speculation in this thread about the finale. All of them are done by The Walking Dead so obviously they aren't really giving anything major away.
Inside the episode:
Making of the episode:
Speculating where it may go from here, pretty vague: