Here are the relevant quotes from the leaked script (in italics), commented by myself as posted in my livejournal:
http://ladyofthesilent.livejournal.com/5003.html#cutid1
Back on the Pearl, Will hides and attacks Jack at night, fully intending to kill him. Of course, he questions him about his feelings for Elizabeth – but Jack is reluctant to answer. Note he steps back into the darkness when Will brings up the topic; obviously, he doesn’t want Will to see his face:
WILL
Could it be we have the same end game in mind?
JACK SPARROW
Could be! As always you hope to save the winsome Elizabeth, of
course.
WILL
As do you, when you’re not trying to save your skin.
Jack regards Will as their swords ring. He steps back into the
darkness.
Then, there’s a lot of sword-fighting (and the missing page 55), and finally, Jack’s great moment, considered by many as completely OOC:
Jack engages Will with a vengeance, parries a thrust into the hull
of the ship. Briefly has the advantage, but doesn’t use it. Instead
he turns and looks out to sea.
JACK SPARROW (CONTD)
I think I will stab the heart.
(Will is surprised)
I’ve been dead, and I don’t want to go back. To live forever, and
see everything there is to see - - maybe twice - - who wouldn’t want
that?
Will pulls his sword from the hull, joins jack looking out to sea.
JACK SPARROW (CONTD)
This life we have is cruel, Will, it mocks us we’re granted just a
taste, if we’re lucky, and then it’s ripped away. I’ve been on the
path to the Land of the Dead. I’ve been there and I’ve done that, I
don’t care to do it again.
Now what’s wrong with Jack? Of course, he’s afraid of dying – who wouldn’t understand that, considering the fact that his death was a rather violent one and his purgatory (a deserted island) not a very nice place to be? But why stab the heart? To become immortal, of course, but there’s more to it. Here, we have a very clear parallel to Davy Jones’s story which is highlighted by Jack saying “This life we have is cruel”. Davy says almost the same thing, something along the lines of “This life is cruel, why should the afterlife be better?”. Then, he refers to his (unrequited?) feelings for Elizabeth: “..we’re granted just a taste …”: Jack wanted to know what it tastes like and Elizabeth showed him when she kissed him – here you can see how much that kiss apparently meant to him – poor Jack!
The 56 pages end with more sword-fighting between Will and Jack, but we can safely assume that the subject of J/E will be followed further throughout the movie.