Apparently the new album Metallica Will be called 'Death magnetic', although it was not officially confirmed by the band, but on their page and in various posts they have hinted that that will be the name.
Also, on the site metallica.com or wallpapers to go down with the name 'Death Magnetic'. The new work will be released in September and was produced by Rick Rubin.
As Lars Urich had stated, the new music of the band metal will be music will be "somewhat hardcore, with many variations, fast and slow songs, melodic, similar to our first recordings".