Board Thread:General Discussion/@comment-24107578-20131117005654/@comment-26973802-20140429042338

Nick Fury has to be popular because he's Samuel L. Jackson so I'm guessing Whedon will save him for Avengers 3 as one of the two (always kills two major characters in the final installment, and I might've taken a quick look ahead to see who the two in Angel are), and the other will probably be a main Avenger.

That being said, if a major character dies in Age of Ultron, I can see it being Hawkeye, Black Widow, Hill, or - if they appear - Rhodey, Bucky, or Selvig. Quicksilver and Scarlet Witch are unlikely because we'll be properly introduced to them in this movie, they only got a postcredits cameo with Strucker in The Winter Soldier