There you go.
In his first column discussing M2010, Aaron Forsythe said this about the new duals coming in M2010:
We wanted to make a cycle of powerful dual lands that risk-averse newer players would like, which meant coming up with something that didn't involve losing life.
This is sort of like a variation on Nimbus Maze, in that it keys off of land types. This is probably better overall than Nimbus Maze, as it's minimally a CIPT land even if you can't pull off the appropriate interaction.
However, my post title comes from the fact that these duals seem pretty exciting for the new fetch-free Extended that's coming up once Onslaught rotates out. Glacial Fortress, for example, can come into play untapped if you control a Hallowed Fountain, Godless Shrine, Temple Garden, Sacred Foundry, Breeding Pool, Steam Vents, or Watery Grave. Now, that is solidly nifty.
This also makes it look like I'm going to get a chance to design decks with my multi-color aesthetic, searching up Basic Lands and activating my M2010 duals, which is nice.
How much should these cost? Hard to say. I think they're okay, but they're not really shocks...
(Also, we don't yet know if we'll have five or ten of these.)