Malcolm Young recently confirmed to Classic Rock magazine that AC/DC is working on the follow-up to 2008's "Black Ice". But he said fans will likely have to wait longer than expected, after singer Brian Johnson suggested there would be new material next year.

"You know what Brian's like. He just says things and then walks away," Malcolm said. "It'll be a little while — a year or two anyway.

He added, "I've been doing some jamming on some song ideas but I do that all the time, as do the rest of the band. We are still working. But we had a long rest between 'Stiff Upper Lip' and 'Black Ice', so I think we need a couple of years to recuperate and work on it a bit more."

During a January 2012 appearance on "The Cowhead Show", the American radio program hosted by Mike "Cowhead" Calta, Johnson revealed that health issues were affecting one of his bandmates, which may have put new album plans temporarily on hold. "One of the boys is a little sick and I can't say anything, but he's getting better," Brian said. "He's doing wonderful. Full recovery fully expected."