Chris Bale is one of the finest young actors of our time right now. Terminator Salvation will be a great movie.
It will not follow the T3 canon but the events in Terminator SCC which story occurs in an "alternate timeline"
This timeline is quite unrelated to T3: Rise of the Machines which is the production company's way of gently
saying "fuck you, your script sucked, Johnny Brancato"... and they're right. He did better this time.
And now ontopic: How does playing a song from a 17-year old record promote the current line-up of GN'R?

It's just a nod to the Terminator fanbase, everything else would be a little bit too fanboyish, don't you think?