Because of this there's a lot of rumors already on the Internet, no surprise, and it seems that now some are starting to theorize that Vision could make an appearance in The Avengers sequel. According to friends over at Unleash The Fanboy, a rumor is being reported about JARVIS voice actor Paul Bettany becoming Vision by the end of the film.
Granted this rumor's origin is the 4Chan boards, which is known to be wrong more than right, but a "Marvel employee" posted the following information about Age of Ultron, Bettany and Vision:
>Work for marvel
>overhear big shots talking about avengers 2
>James Spader is Ultron
>avengers fight off multiple Ultrons
>Jarvis attempts to hack Ultron
>must make physical contact
>Paul Bettany to become Vision
>Vision defeats Ultron
It is very important to note that The Daily SuperHero could go to 4Chan, create an account and claim to be an employee of Marvel, so don't get too excited. Let Marvel make an official announcement since now they issue full confirmation releases on their own website when they are ready to go public with casting news. Recently, they've confirmed Robert Downey Jr. will return as Iron Man in Age of Ultron and in Avengers 3, they've confirmed James Spader is Ultron and they also confirmed Bradley Cooper will voice Rocket Raccoon.
Until Marvel is ready to make something official, everything needs to be taken with a grain of salt. Period.
[Related Story: IRON MAN 3 Writer Drew Pearce Says No One Has Guessed Ultron's Origin... Yet]