I've read some of the linked material, but couldn't figure out whether this will end up being one mega-mod that you load via Nexus or Steam Workshop. If it's a paid-for mod, they'll need Bethesda's blessing at the very least, if they use any of the Skyrim assets (as it would appear they are, from the screenshots).
Will you be able to walk from Skyrim over the mountains into the next area? (couldn't tell you what's next door, my lore knowledge isn't strong enough yet)
Perhaps it'll act like adding a library of thousands of side-quests to Skyrim