Daenarys also has a role according to starwars.com
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In Episode 8, they will create a 4th death star powered by the Starkiller Sun, which can transform into a giant robot named Unicron. This is all "rumor" for now, but just wait.
Probably already common knowledge, but my local TRU recently moved these figures from the toy area to video games. All the various movie-related lines are in this new section, that I'd never have even walked by if I wasn't specifically looking for it. Might be worth checking out. I saw some GOT figures there, but didn't look closely at the rest of the FUNKO stuff.
Mads Mikkelson's character didn't want to build the Death Star, but went along with it - so he built the thermal exhaust ports into the death star on purpose, hence explaining why it's so simple to destroy it.
Maybe he was good buddies with Darth Doofenshmirtz and added in a self destruct to his Planet-blowing-up-inator.
I'm just excited we've got a bunch of new characters, almost none of which is known to survive (granted we don't know if they die either). I'm looking forward to the freedom the story will have to kill significant characters in the movie and surprise us.
I hear Darth Vader survives.