I just checked the US Apple Store and the iSight is still available for purchase, it just has 3 weeks lead time. Could this be the rumoured update? Could it just be they have run out of stock? It doesn't matter to me I'd never buy that thing you linked too.
Apple updated the shipping estimates from 'October' to 2-3 weeks, in the last 24-hours. Rumour is it will be selling from next Tuesday. It's unclear whether it'll be a true update or simply a change in some of the component materials used, to adhere to the EU Nasty Materials law (don't recall the name).
The iMage looks good, but no mic - I'd like the iSight for my MacPro & iBook, so the Mic would come in useful for the Mac Pro.