You can find the unedited chat log of Saturday night's... er, conference with the Gas Powered Games' team. When a site comes up with the edited version, I'll post news of that too. Here's something I picked out:
Q: How far can you see DOWN before fogging takes over?
A: You can set the fog yourself.
A: If you set your fog past the size of the frustum, you'll see the edge of the world. Of course, you can always up the size of the frustum to compensate, but that's going to take more memory and CPU.