When it comes to "nerd" cinema, some get riled up about the need to explain plot points and suggestions to the "normals" in the audience. But even if its not readily apparent who is supposed to fall in love with whom, or who killed whom in a previous life, people generally seems to get these movies. That being said, it will be curious to see how audiences will react to the character of Quicksilver appearing in a big summer movie for the second year in a row with 2015's Avengers: Age Of Ultron.
Speaking with IGN, Kevin Feige revealed that he is in charge of making sure the new Quicksilver bares little resemblance to the Quicksilver of X-Men: Days Of Future Past. As such, he worked with Joss Whedon on Avengers: Age Of Ultron to create a character that will most certainly not remind the casual fans of the guy with the same skill set from that big movie a year ago. Says Feige:
"We are very much playing up two things that [Days of Future Past doesn't] play with: one is his relationship with his twin sister, Wanda; the other is, his backstory as an Eastern European child of a war-torn country, and we follow him throughout the whole movie -- him and Wanda -- as it relates to their feelings about the Avengers and how that shifts and changes over the course of the movie. So it's a very different thing than coming out from one, unbelievably awesome showcase sequence of the movie, and much more interwoven throughout the entire movie."
To be snotty about it, this Quicksilver actually has a character arc! Evan Peters was a great deal of fun in Days Of Future Past as an entitled brat, but his entrance and exit from the film happened too briefly, failing to capitalize on any of the dramatic meat that could come from his relationship with father Erik (Michael Fassbender). Presumably that knotty issue will resurface in X-Men: Apocalypse, but those X-Men movies are so busy that they rarely slow down for interpersonal conflicts.
Aaron Taylor-Johnson, however, comes as part of a package deal with Elizabeth Olsen. Instead of Magneto being their father, they are now struggling orphans who have presumably political anger towards the Avengers and the American imperialism they represent. Very clever to have the duo emerge from Eastern Europe as "orphans" by the way, lending some mystery to their childhood: you'd like to think Marvel was leaving the door open to possibly nabbing the X-Men rights and having the dramatic reveal that Quicksilver's dad is the Master of Magnetism.
There's also the matter of his sister, whom he'll apparently share a certain closeness. Quicksilver had plenty of adventures of his own in the comics, but he was also frequently by his sister's side, the two of them finding solace in the fact that they were mutants in a world that feared and hated them. The Avengers are a volatile group, but the one thing they aren't is family. Strong characterizations could go a long way towards creating a unique new dynamic amongst the heroes.