I've never really watched Aqua Teen, but heh, perhaps this is a good time to start doing so.
What planet do you live on Mits?! How have you never watched Aqua Teen! That's absurd! You'd probably love it. As a fan of the show, this whole "getting a metal band to be in the movie" doesn't come as much surprise, since more than once the focus of an episode has been some metal icon. Once it was Foreigner (though I guess its debatable if they're metal), once Ted Nugent (he shot flaming arrows, it was awesome), and there were a whole bunch of other instances. I guess the guys who do the show are just big metal freaks, like you! You should definitely check it out.
As far as a movie, I'm a little concerned. Just because the show works so well as a 15 minute blurb of nonsense, I have trouble imaginging that stretched out to an hour and a half or two hours. I mean, I figure I won't turn my back on it quite yet, since its the same two guys doing all the writing as it is for the show itself, not to mention the show's creators, and I have to imagine they wouldn't do something they deemed bad for their own show. Did the article happen to mention a possible release date?