As far as I know, the latest is CS6 or CC - there is no CS8 yet! If you mean Photoshop 8, then I have some bad news - the latest camera raw plugin is only compatible with CS6. Older versions of photoshop may have older versions of the plugin shipped with them, but these will not be compatible with newer cameras. Also, Photoshop 8 is rather old, I am not even sure that it has any support for the RAW format whatsoever.
In any PS version you should be able to open the file as you would any other. It will open up the RAW file screen where you can further edit any coloring or temperature of the photo before opening it to edit directly in Photoshop.
Open the PSD in CAMERA RAW and then if you need to undertake any editing do so and save it through "SAVE AS" in Camera Raw
Adobe Photoshop CS8 most likely WILL BE compatible with OS X, the most current version CS6 is compatible. At this time my crystal ball is malfunctioning, so I can't look into the future to check for you, sorry.
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