RAW format compatibility with iPhoto

I am looking for a new camera that supports RAW. It is my understanding each camera manufacturer uses a different file extension on their RAW images implying there is a difference between the file formats. The list that Apple supplies for cameras that can be used with iPhoto is not up to date as many newer cameras do not show up on their list.

Would it not be safe to assume that if, for example, Canon comes out with a new camera with RAW format support their file type which is .CRW would automatically work with iPhoto. The same would be for Nikon, Olympus and the rest. If the new camera uses the same file extension as one of the older cameras by the same manufacturer on Apples compatibility list the new camera will be compatible.

Here is the list of extensions I found by manufacturer.

.raf (Fuji)

.crw .cr2 (Canon)

.kdc .dcr (Kodak)

.mrw (Minolta)

.nef (Nikon)

.orf (Olympus)

.dng (Adobe)

.ptx .pef (Pentax)

.arw .srf (Sony)

.x3f (Sigma)

.erf (Epson)

.mef .mos (Mamiya)

.raw (Panasonic)

.r3d (Red)