You won't find this on Western Digital's site yet, but eagle-eyed tipster Scott, came across this unannounced 1TB My Book Pro II Edition external storage solution while shopping Provantage. This is a dual-drive system so we're looking at a couple of 500GB drives spinning at 7200RPM packed in a bulls-eye tome with Firewire 400 / 800 and USB 2.0 interfaces. Features include RAID 0/1, backup and recovery software, and 3 year warranty for $513.49, exactly. Sorry, no product image, but other than a color change, the Pro II isn't likely to differ from the existing My Book lineup pictured. No reason to doubt this is coming, it's gonna happen sooner or later.
Update: Yup, it's the real deal, and reader Michael G. was kind enough to direct us the 1TB MyBook's Buy.com page. As we suspected, it looks pretty much the same as the less capacious versions, although this new "book" is so fat that it seems WD is really stretching the whole attempt at literary camoflauge it's got going on here.