i really liked it, especially the fact that you uploaded it in a far-from-complete form, which was quite nice to see. the only two things i wasnt too sure about was bens speech on tatooine, im not sure how much it will break up the pacing, but it seems to make alot of sence:

leia goes to rescue han, they BOTH get captured (like in ESB)

luke goes to rescue them, but this time succeeds.

the other thing though is the arrival of the emperor, could you leave this until they go to the rebel fleet? its a good way of establishing a shift in storyline to fighting empire as oppose to fighting jabba.

i liked the alternative fate of the droids, ie being taken straight to the dungeon, and the executor appearance, though vaders little intro may not be necessary. id rather not see him until the second half of the film with the emperor.