Hot on the heels of the release of the ‘Avengers: Age of Ultron’ TV spot, with more behind the scenes footage, this latest offering comes in the form of an interview with writer/director Joss Whedon, in which the focus is squarely on the film’s characters.

The interview begins with some discussion of Vision, who has yet to be officially revealed beyond a brief glimpse at the end of the recent trailer. Echoing comments he has made in the past (and indeed, later in this very interview) regarding Quicksilver and Scarlet Witch, Whedon underscores the degree to which he considers Vision part of “the DNA of the Avengers,” by pointing out that he’d pitched the character to Marvel before he’d even committed to ‘The Avengers’ several years ago. He also explains just what it is that makes Paul Bettany such a good fit for the role, citing his “stillness that goes beyond British,” adding that Bettany will blow people away.

But what is arguably the most intriguing portion of the interview is also the most fleeting. Toward the end, Whedon is asked if any “Marvel characters that aren’t yet in the preview photos,” who we’ve “seen in other films or other parts of the universe,” to which he replies with a simple “yes.” If I were a betting man, I’d say the smart money was on the presence of Anthony Mackie as Falcon or Hayley Atwell as Peggy Carter, both of whom are listed on the film’s poster despite not having made any substantial appearances in preview footage. Similarly, he could also be referring to Loki and Heimdall, played by Tom Hiddleston and Idris Elba respectively. Both actors are confirmed to appear, but virtually nothing has been announced beyond that. The statement also fuels speculation that Chadwick Boseman may appear in some capacity ahead of Black Panther‘s official debut in next year’s ‘Captain America: Civil War.’

Check out the interview for yourself below.

‘Avengers: Age of Ultron’ hits theaters on May 1st and stars Robert Downey Jr, Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Samuel L. Jackson, James Spader, Elizabeth Olsen, Aaron Taylor-Johnson and Paul Bettany.