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-...you are a gigantic female genitalia sanitizing apparatus.
1. Bungie never said they were quitting Halo. They said that after Reach, they want to move on to another project. They never said what. It may be Halo, or it may not be. If it isn't, 343 could do a Halo game. Which doesn't mean they might not come back after to continue Halo once again. After so long, they might be burnt out, after all.
2. Natal will probably retail for 50-80 bucks. Maybe 100 MAX. Don't forget that it's not mandatory for future games. Some games might use it as an alternate controller, some might use it as the only means of controller, but games like those will likely be bundled with Natal for a lower price.
3. Rock Band>Guitar Hero.