It is. And "Documents and Data" is just a wrapper term to mean "App Store apps have APIs to sync data with iCloud", whether it's a Mac or iOS app. It doesn't mean "Just iWork documents".
I think the reason for confusion is just... so few apps support it yet. Not even iWork on the Mac supports it yet, I don't think.
I think the reason for confusion is just... so few apps support it yet. Not even iWork on the Mac supports it yet, I don't think.