I don't agree.
I think there's two components to it:
The first one is that it probably in the best interest of Apple to start hinting at a new release to build hype pre-launch and get people ready for opening their wallets. Preferably the planted rumors is placed in a way that it reaches enthusiasts like us, before it reacher the general public.
Second one is that there's a huge hype surrounding Apple products, so if something new was being made somewhere, leaks of new parts and out of focus/distorted images of new parts/prototypes are pretty likely to surface.
So based on this I don't think we'll see an unveiling where the product can be bought right after announcement at WWDC. Perhaps they have prototypes built in their top secret labs, but then they're not ready for mass production, and you won't be able to get your hands on the product until fall (probably).