Olympus UK apparently slipped up and posted the model number of the forthcoming successor to the Olympus E-510 on an info page regarding image quality.  The offending text has been removed; however, this is the passage that was purportedly published by Olympus:

So that you don’t need to carry a heavy tripod or invest extra money into every single stabilised lens, Olympus integrated a built-in image stabiliser into the camera body of the E-3, E-510 and E-520. It stabilises up to 5 EV steps (up to 4 EV steps with the E-510 and E-520), making it the most effective solution on the market.

You can see the can see the redacted version of the page here.  Note that the “and E-520″ is gone, which makes the listing of “E-3, E-510″ read awkward since there is a comma in a list of only two items.  The cached version of the page shows this current version as well.  (via dslruser.co.uk)

Since the E-420 was just recently released, the follow-on of the E-520 certainly comes as no surprise.  We’ll keep our ears to the ground and pass along the latest news and rumors on the Olympus E-520 when it arrives.