Well, let me give you my perspective.
First, this is not the absolute ideal thing I wanted for Greyhawk. It's a DMG tutorial, not a full campaign setting. But instead of concentrating on that, I am considering the following-
1. It comes with a map! That is actually pretty cool. That's one of the things I was hoping for. Will it live up to the magic of the Darlene original? Probably not, but I'm giving it a chance.
2. It won't be "over-lored." One of my favorite things about Greyhawk (the original folio and the '83 campaign setting) is that it wasn't stuffed to the gills with lore; instead, it was full of bare descriptions and tantalizing hooks for the DMs to determine how to use. Not to mention plenty of open spaces that begged for adventure. So, in a certain way, having this be a tutorial will ensure that GH will stay as the setting that the Forgotten Realms steals from tables fill in.
Finally, the perfect is the enemy of the good. I am happy that we are going to see it, and will withhold judgement on the implementation until, you know, we actually see it.