Yep. Jon Peters is still attached. I do think he's been sidelined, and with Singer's previous attachments to Richard Donner (via X-men, and Donner's wife on X2) he's much more interested in preserving the films' mythos. (That said, I'd rather have seen Millar and Gough take Smallville to the big screen; I don't know WHY Tom Welling wasn't cast, because poll after poll showed the public wanting him to don the tights and cape). But I digress ... back to Jon Peters: The second paragraph of the official press release dated 10-22-2004 on Routh's casting announcment confirms:

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The untitled Superman movie is expected to begin principal photography in Australia early next year for release in summer, 2006. It is produced by Jon Peters, Bryan Singer and Gilbert Adler from a screenplay by Michael Dougherty & Dan Harris. No other casting has been announced.

Bring on those frickin' polar bears and the gay Jimmy Olsen. As Homer Simpson suggested "All this movie needs is a robotic pie."