Mustaine retired from music a couple of years ago when he sustained an injury (something to do with his radial nerve) on his hand, which prevented him from playing. But now he is healed! And making a come-back.
Sad news, for me, is that long-time bassist David Ellefson (http://www.davidellefson.com/) is no longer in Megadeth. I dropped him an e-mail last week, and to my delight he replied. Keep an eye on his website for the latest in his goings on, particularly with a band called F5… that should be refreshing!