Ralph
Chan was mentioning another type of E lenses, not the Series E manual focus lens you know. This one is very recent and only a handful of digi-idiots can use it. It is expressed by an E after the aperture. So, it would be an AF-S 50mm f/1.8E, which doesn't exist.
These new E lenses got rid of the last mechanical link between body and lens: the auto aperture lever.
If you read properly Chan's post that's what he says.
Yes, there is a 50mm /1.8 Series E.