I hope it's not true, but rumor has it that Malcolm is very sick and the band won't continue without him. Supposedly there will be an announcement tomorrow. Apparently he has blood clots in his brain and has forgot how to play guitar.
http://www.blabbermouth.net/news/conflicting-reports-surface-regarding-acdcs-future/
http://www.blabbermouth.net/news/conflicting-reports-surface-regarding-acdcs-future/