Pro Application Support 4.0.1 - use with FCP 5, etc?

Apple has released "Pro Application Support 4.0.1" (see http://www.apple.com/support/downloads/proapplicationsupport401.html) What's not clear is whether this is only for users of Final Cut Studio 2, or do these updates work with/apply to previous generation applications like FCP 5, Motion 2, Soundtrack 1, etc. I can't find any more detailed read-me.

Thanks,
Judd