Ok, just a sec, I have to take back what I said. I just got to thinking about the various possibilities, and some of what I said was wrong. So I made a few tests. It seems that Photostream actually does have RAW support, but only in one direction. If a RAW file is imported to a Mac, via iPhoto or Aperture, the it's placed into Photostream as RAW. Any other Macs with Photostream turned on will receive the RAW file, while iOS devices will see a reduced size jpeg in the Photostream. The interesting thing that I didn't expect is that the same thing happens with RAW files imported to an iPad via the CCK. RAW is imported to the library, placed in Photostream, and Macs get the RAW, while iOS devices get reduced jpegs. Edits made to RAW photos in iPhoto for iOS and saved to the camera roll appear as jpegs everywhere in the Photostream, however. So depending on your workflow, let's say you import RAW files to your iPad, make edits in iPhoto (or any other app) and save back to the camera roll. You'll be able to open Aperture and see BOTH the Original RAW and the edited jpeg in the Photostream. Again, this is more a feature of Photostream which can be taken advantage of in Aperture. It doesn't matter what iOS editor you use.
