Don't make the mistake of assuming Conduit will sell a lot just because there's Internet hype for it.
We all remember the hype for Zack & Wiki, and even though this game ended up selling well, it didn't sell as much as the hype suggested.
That said, it could sell really well if it's decisively better than the other shooters on the Wii. Remember that we don't know much about the gameplay though. The controls seem good judging from the latest videos, but we're still guessing. We don't even know what publisher will carry the game, or how well it can get advertised.
COD5 could sell 2-4 million if it is fully-featured like the developers say.