Tuesday night's "Marvel Studios: Assembling a Universe" special on ABC promised a peek at "Avengers: Age of Ultron," and delivered with concept art featuring the first looks at how new additions Scarlet Witch (Elizabeth Olsen) and Quicksilver (Aaron Taylor-Johnson) may appear in the 2015 sequel.

Concept art featuring returning "Avengers" Black Widow and Hulk also debuted on the special.

Written and directed by Joss Whedon, "Avengers: Age of Ultron" is scheduled for release on May 1, 2015.