Its good to finally have confirmation that talks are taking place. After reading that interview I will be shocked if the original actors don’t return to reprise their roles. The fact that he said Lucas proposed to write them out of the script if they didn’t return tells me their roles are fairly small. I imagine that Luke will probably have the biggest role out of all the original characters, though.
So Mark Hamil is proposing a Salacious B. Crumb movie? I would not oppose this.