I'm guessing that most professionals would probably want to do post processing of the photos before uploading them.

Publishing != uploading.

Uploading can get images to durable storage, so they can't be lost. Uploading can also make images available to co-workers.

Yes, the shooter can do the upload after the fact, or interrupt, but automatic/loose-real-time means that it happens reliabily and in a timely fashion. The alternative is an assistant.

I don't think serious photographers want a button on their camera body labelled "Facebook this!"

But they probably do want "post to flickr/smugmug/etc."

They want that in their editing software, but even if high-end cameras start getting a screen as good as the iPhone4; most pros are very careful about what they make public.

I disagree. I certainly wouldn't buy a serious camera that tied me to any one online service. Definitely put that stuff on cheapy kids cameras, but not on better cameras.

Certainly if you're "tied" to it. But why not be able to upload a picture quickly, while still having it left on the memory card?

isn't that what the eye-fi card thingy does?

I just don't want extra addon-service crap in my camera.

I doubt professional photographers would want that. But I can imagine they would want a "auto-backup to a secure account."

Many high-end cameras are bought by "prosumers," not professionals per se.

All their cameras should communicate, but where they're under attack, where their lunch is going to get eaten if they don't do something soon, is at the low end.

They can already, although only Wi-Fi: http://web.canon.jp/imaging/wft/wft-e2/index.html