Yup, I think those questions have been answered about as much as we can without spoilers.
Make sure to read all the entries in the glossary of TTT. Some of them are just names and dates, but there are some good entries in there. I guess 'all' is an overstatement - Be sure to read any of the ones that are more than a sentence, as some of them are cool bits of history or very short stories in themselves, and provide a lot of information that you won't see elsewhere.
Edit: Have salt handy, as everything should be taken with at least one grain.