Gen Con was great.
But I only picked up ONE book my entire time there, the new 4e Blackmoor book.
Reading it back in my hotel room I was overwhelmed with the feeling I was reading a new version of the D&D Rules Compendium.
There are a lot things in this book that are familiar to me. Wokan(i), Arcane Warrior, Nobles. The races are standard 4e, and even explains how to work in some of the newer ones.
But what I like is now I have another piece of my puzzle. I am placing Blackmoor on my North Pole, past the land of Black Ice (Greyhawk). Blackmoor sits inside a crater carved out the north pole where the former Blackmoor had once stood. This explosion created a crater (in Mystara this would have blown a hole in the planet, making it hollow) and the refugees settled here. Blackmoor then becomes something like Shangri-la and Atalntis. There are people there, shut off from the world, maybe even thinking the rest of the world had been destroyed.
Some survivors of the great Blackmoor explosion went south and settled in the lands that later became the "Known World" that is why these lands know about Blackmoor, use similar names for things and why so many different cultures have settled in such a small area.
My Blackmoor is only about 500 miles across and about 250,000 square miles of area, so about the size of France. Geothermal activity keeps the area warmer than would be expected, and the high mountains keep the area remote.
Though it doesn't *exactly* fit with my plans for my world, I might keep the Dragonborn there as well. They are a different sub-species as my Dragon-isle ones. These would be more "human" for lack of a better word.
More after I read the book some more.