Re: 5 things you want to see
1) Ultron upgrades into the Destroyer armor.
2) Clint, Wanda, Steve and Pietro fight back to back to back to back in an homage to the cover of Avengers #24.
3) In a reversal of the "I'm always angry" moment in the Avengers, Ultron encephalo blasts Hulk mid-punch, changing him into Banner.
4) James Spader introduces himself - "I'm Henry Pym"
5) Post credit scene teases Marvel's newly acquired franchise - The Fantastic Four.