Does Anyone Know Who's Playing Seth? 

nobody knows for sure as he's not been cast yet,
but i've got a theory that they might let the winner of the US competition (where the prize was to be in new moon) Ky Wildermuth play Seth, but thats just my theory.

they are having open castings soon, i posted a link about it

hi my name is jamie river i am 15 yrs old and i would love to play the role of seth its been on my mind ever since my mom saidni look just like sth clearwater i think i a good chance of playing the part, i will have some photos soon so you can decide but i am just asking for anybodies support.THANKYOU