My sneaking suspicion will be we'll get these sorts of tools in the DMG with how they present Greyhawk in the DMG - so, it will be a light touch of canon stuff to get the ball rolling and then a bunch of "here's how you do this. This is what we've done in this location, now, you can do this in other locations" kind of stuff. Which I'm perfectly happy with.
After the DMG though, if they keep with the AP approach, we'll get more stuff like Ghosts of Saltmarsh, or, really, how Forgotten Realms has been presented in 5e so far - a big meaty adventure every year, set in and around a specific part of Greyhawk, with a few forays into other parts here and there.
Again, not a problem. I'm perfectly happy with the approach they took with FR in 5e. A very light touch setting book and then a bunch of adventures set in FR. Great.
Really, this is how Paizohawk was presented as well during 3e with the advent of the Adventure Paths. And theirs is nothing wrong with those adventures.