As I keep saying: *something* has to give Ultron these powers. You can build Frankenstein's Monster, but until you get the lightning storm and all the nifty Tesla coils to grant him life and power, he's just a spare-parts zombie. We've got Dr. Strange coming right around the corner after AoU (it's not unreasonable to look for a 2016 release date there), we've got Joss flat out saying that Wanda is a witch, we've got TDW bringing down Aether and dark magic and all that jazz on the planet. There's an earth-changing event at the end of CATWS (and I highly doubt it's something as mundane as a shakeup in the power structure of SHIELD), and the title of this film is officially "AGE of Ultron," which smacks of a new era (or an alternate timeline/universe, favorite tropes of comic books from time immemorial).