Savage Opress
Who Is He: A Sith apprentice briefly trained by both Asajj Ventress and Count Dooku as part of their plots to assassinate each other. He later became a renegade and found a new master: his brother, Darth Maul.
Why We Think Hell Die: Hes a cheap Darth Maul knock-off without much personality. Unless his character is built up more, hes a deadweight. Plus hes got the Jedi, Darth Sidious, Count Dooku, and Asajj Ventress after his blood. Unless he runs very fast and very far, he wont survive for long.
Why We Dont Think Hell Die: His character development doesnt feel complete yet. Plus, theres been substantial build-up (including a three episode story arc introducing him) to create him and get him to this point so why waste it.
How We Think Hell Die: Hes an incredibly skilled fighter enhanced by Dathomirian magic and the Dark Side of the Force so its got to be a major character thats responsible for his death. We see him fighting Darth Sidious in a trailer so he seems like the obvious candidate. However, (this is a very left field idea) I cant help but think that Darth Maul may kill him for some reason. The Sith always betray each other, and a power is a greater lure to a Sith Lord than familial loyalty.
Darth Maul
Who He Is: A Zabrak Sith Lord who was cut in half by Obi-Wan Kenobi after he killed Kenobis master Qui-Gon Jinn and the best character in
The Phantom Menace despite having only three lines. Now resurrected and out for revenge with Savage as his apprentice.
Why We Think Hell Die: His story arc seems to have a finite length. Judging by the trailers, hell eventually become so much of a threat that the Republic or the Separatists will intervene. And like Hondo Ohnaka, hes just got too many enemies to live a long and fruitful life.
Why We Dont Think Hell Die: Theres been far too much effort and hype put into his return for them to kill him off after only a year. His return was teased a year before it happened and hes on the cover of the Season Four DVD boxset. Theyre putting as much effort into making him as strong a character as possible so I doubt theyll him just yet. Plus theyve barely released any Darth Maul toys yet.
How We Think Hell Die: At this point its bound to be being struck down by a Jedi or Sith. So I think it will either be Savage Opress fulfilling the Sith tradition of the student killing the master, Darth Sidious to preserve the rule of there only being two Sith and to stop Maul from becoming a threat, or Obi-Wan will finally get to finish the job and avenge Qui-Gon.