On my journeys arround the big wide web, I found an article about Tarrantino's alleged plans to make a Sequel and Prequel to the already fantastic Kill Bill (and we've only seen the first section).
Apparantly, the first part features a more indepth following of O-Ren Ishii and the history of the nameless Bride (black mamba). This is intended to be purely in animation, as to follow the theme of the flashback featured in the volume 1 film.
The second part follows the aftermath (not animation) of the characters involved (those alive) and is meant to follow a theme that acts of revenge need revenge, because "revenge is never a straight line. It's a forest..."
I don't know if this is true, or been posted yet... but thought you'd be interested. Personally, I think it's very likely to be fact. Tarrantino is famous for over-writting scripts recently. Once he had finished, Inglorious Bastards panned out to be the equivalent of three feature length movies.
According to reports, the anmie will be released relatively soon, but the sequel will take some time longer.