In terms of killing of Kalecgos, I don't think Blizzard would do it soon. That would cause more drama with the Blue Dragonflight, and I think Blizz is done with that after everything regarding them in WotLK and Cata. Also, Jaina and Kalec are "dating" according to the book (Human v. Dragon. I know Kalec/Anveena was Dragon v. Super Girl, but still.) Killing off Kalec would probably enrage her more, maybe close to the point of insanity.
Besides, Kalecgos is kinda in the "rising star" phase of characters. Blizzard usually doesn't kill off rising stars. Last I checked, George R. R. Martin doesn't write Warcraft lore.