Quentin Tarantino has the story for Vol. 3 which will see Nikki, daughter of Vernita Green (played by Vivica A Fox), seek out The Bride in 15 years.
Nikki will be raised by Sofie Fatale, who will have inherited all of Bill's money and hopefully bought herself two new arms (Yes she DID lose both, watch the Japanese version of Vol. 1 for proof)
However QT wants to use all the same actors for Vol. 3. Ambrosia Kelly (Nikki) Julie Dreyfus (Sofie) and Uma Thurman (The Bride) so he will wait until they've aged and hopes Julie and Uma wont give in to the botox craze along the way.