All ten are available.
Personally I am hoping it lowers a bit. 3-5 seems better.
Reason for this is that everyone can join all guilds there are and metagaming, even if unintentional, won't be hard. combine that with the death system and you will get situations where one person obtains info on an alt that might cost the life of a few people in his main's guild and he could prepare for it rather then it being an ambush or something.