I just went to XMRadio.com and see no evidence that this is temporary.
http://www.xmradio.com/onxm/channelpage.xmc?ch=53 Am boggled. I don't mind - it's always nice to have a comfort-music backup plan when all my other stations are playing Come on Eileen, anything by Fleetwood Mac or John Cougar Mellencamp.
But it is odd.. I mean, there is a lot of AC/DC music out there, but is there really enough to support a 24/7 station?