Ah, I see. The only one who's "supposed" to die is Donna. I will be very impressed (if very sad) if the Doctor truly, permenantly regenerates-
- sorry, SPOILERS!! -
-and they've managed to keep quiet about it. Hell, even the Doctor Who website couldn't keep other returning cast members next week quiet. They're lucky if they can keep a single scene secret, let alone a whole 65 minute episode.
UPDATE:
"This is my ultimate victory!" - new trailer. Doesn't reveal anything new apart from Davros ranting just like the good 'ol days, but cool!