This project is Dead
. You cant fix camera,bluetooth and power management issues of iphone 2 and talk big about iphone4.
Just because it's a different device doesn't mean it's harder. Those issues are probably actually much easier to solve on the iPhone 4 due to its hardware being more common. The reason they haven't been solved on the iPhone 2G or 3G is that nobody is working on those devices anymore, and as such, no progress is made.
To my mind, iDroid must be oriented on iPhone 2G or 3G, because, this project will be mostly used by those, who wants Android system, (or something new) but does not have enough money to buy it. These are 2G and 3G users. No one will use iDroid on iPhone 4, because iDroid won't be optimized as well to prefer it to iOS4-5. Also, if such user wants Android system, it will just get a very good smartphone with Android system.