OT
Luke Skywalker: James Franco
Han Solo: Gene Wilder (Charlie and Chocolate factory GW)
Chewy: Shaq (Kazaam, and maybe a wookie dunk contest)
Leia: Kristen Stewart (we've cornered the tween market)
Lando:Robert Downey Jr. (Tropic Thunder style)
Boba Fett: Temuera Morrison
Vader: James Earl Jones (Voice) & Gerard Butler (Suit)
Palpatine: Revive Leslie Nielsen and have him play palpatine
and comedy ensues
Ole Obiwan: Cary Ewles
Just for fun PT
Qui Gon: Liam Neeson for sure
Obiwan: Ewan McGregor
Darth Maul: Ray Park
Jar Jar: Not cast in movie; instead, replaced with Dave Chappelle who is a human and not a terrible Jar Jar.
Anakin: That spaz from "incredibly loud and up close" or whatever it's called
-or Herschel Walker (former Cowboys Running back)
Padme: (Natalie Portman)
Dooku: not cast, Darth Maul lives. Dooku was stupid.
Jango Fett: Temuera Morrison
Mace Windu: Samuel L. Jackson
Grievious: The Madison Square Garden