according to this video(http://www.youtube.com/watch?v=bNSbs6OJnVE)
Metallica is apparently going on tour to rival pink floyds the wall and they say it will be the best ever and that they will be working on a new album and start writing songs in april/march of 2011




update:found the article here (http://www.nme.com/news/metallica/50260)