Leaked. I'm skipping around and it appears to pretty much cover all ground in Metallica's career, from Kill Em All to the Load eras to modern.
Listen to this though. Found it on the Metallica subreddit. Meh sound quality but it's easily Metallica's best thrashy song since their heyday. I haven't heard James spit fire like that maybe ever. Amazing tune.
http://www29.zippyshare.com/v/sgissmvq/file.html