Although I love a lot of what Deborah and Lancer have said, what she does really depends how much time she has as far as movie, miniseries, miniseason, or full season (this is the complete Utopia - but it can't hurt to shoot for the moon!
Assuming that we get what I think a 6-8 hour movie. I think it will concentrate on Luke and Lorelai and the SH townspeople. I'm assuming that AB will only be a minor character, as I doubt she will want to put the time and effort into being more. But I believe we will have to have the season/story begin after that kiss or within a few days of that. I think most likely, the miniseries/miniseason will cover a span of years like the Season Finales of "Will & Grace" and "Mad About You." The Palladinos will have more time than just one or two 1/2 hour episodes so the time span will be less choppy. And in the end, Luke and Lorelai will have the life we all wish for them.