See, I'm not sure you will see a sale. It's a limited edition bundle. Rarely do you see a sale on those, that Toys R Us thing was really a rare occurrence. I didn't see any deals on the black ops or killzone 3 bundle. And as popular and highly anticipated as Uncharted 3 is, this thing will go quick.
Why can't Sony be a little creative with these bundles? All you get is a vanilla system and controller. Look at the recent Gears of War 3 system bundle MS put out. Cool graphics on the system and controllers both.
A lot of people buying new systems are people that are new to the console. So they might never have played the game. And then there are people that don't like it. And others might like the game, but for whatever reason might not want a specific paint scheme/design on their console. A solid black console goes nicely in almost any living room. One with a Gears of War paint scheme? Probably not as many as a solid black. So when you release a bundle with a paint scheme of a specific game, you are kind of painting the purchaser into a corner. They are mostly designed at die hard fans of the particular game.
Besides, you can always buy skins.