[UPDATE: Trades Confirm Olsen is in Talks for Scarlet Witch]

The Scarlet Witch character isn't making an appearance in next year's X-Men: Days of Future Past despite her brother Quicksilver having a small part to play, but Joss Whedon has big plans for the pair in The Avengers: Age of Ultron.

While there remains many questions and mystery surrounding the interest in including the character(s) in both the X-Men and Avengers franchises from rival studios, Bryan Singer's take on half of the duo has already been shot with Days of Future Past wrapping production this week. For Joss Whedon and The Avengers 2, they're still in the casting process.

From the sheer amount of buzz and headlines raised from Aaron Taylor-Johnson about being in talks with Marvel Studios about playing Quicksilver for The Avengers sequel, it seems all but confirmed that he will play the speedster. As for his sister, earlier reports had Saoirse Ronan being used as a design template for Scarlet Witch with the young actress even expressing her interest in working with Whedon.

The latest rumor is therefore a little strange, with Bleeding Cool claiming that their sources reveal that Ronan was offered the gig but turned it down. Why would she do such a thing? The source continues to explain that Marvel has instead turned their attention towards up-and-coming star Elizabeth Olsen, another proven talent who's making the jump from indie fare to mainstream studio flicks next year with Godzilla.

UPDATE: THR confirms Olsen is in talks for the role. 

Both names are incredibly talented and proven to be so and if the decision is truly one or the other, it's a good problem to have for Whedon and co. The one key difference however is that the same report which initially tapped Ronan for the role explained that for the sake of the Marvel Cinematic Universe the origins of Pietro (Quicksilver) and Wanda Maximoff (Scarlet Witch) would be altered to make them British.

Quicksilver and Scarlet Witch Confirmed for Avengers 2

Not only would the "brother-sister act" not be the children of X-Men villain Magneto and of Eastern European descent, but they could even have the source of their powers changed since there are complicated rights issues between Fox and Marvel both being able to use the characters in their films. From Aaron Taylor-Johnson's words, the Quicksilver character will still be all about super speeds, but for Scarlet Witch and her over-powered abilities, there remains a big question mark and it depends on just how deep into crazy Joss Whedon wants to go with the franchise. By that we mean Scarlet Witch can alter reality but we're unsure of whether or not that sort of plot element would be introduced this soon in the Marvel Cinematic Universe.

In any case, if the origin rumors are true, Olsen obviously isn't British (Ronan is Irish, Johnson is British) so would that entail a fake accent, a lack of accents from the pair, or something else entirely?

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Thor: The Dark World on November 8, 2013, Captain America: The Winter Soldier on April 4, 2014, Guardians of the Galaxy on August 1, 2014The Avengers: Age of Ultron on May 1, 2015, Ant-Man on November 6, 2015, and unannounced films for May 6 2016, July 8 2016 and May 5 2017.

Let me know on Twitter @rob_keyes who you think should play Scarlet Witch!

Source: Bleeding Cool & THR