From what I've heard, they're planning on making some upgrades to the 2009 version. Let's hope this means a bigger engine. Then again, 425 bHP isn't really *that* bad. Especially since, like you said, you could supercharge it.
Anyways, when they were first planning it, it was proposed to drop the 392 Hemi from yesteryear into it, change the paint job a bit, and market it as (essentially) a beast. That engine would shoot out 525-540 bHP which would probably satisfy a bit more.