1. Why do we need a separate app to access iCloud Drive?! It's redundant. It's part of the share sheet, does not need to be anymore than that.
2. No, we don't know this. You're presenting guesses as facts. Not the same thing. iCloud is already in finder in Mavericks. iCloud Drive is just an expansion of this. I'm not saying they will bring iCloud Drive to Mavericks, I'm just pointing out that until the announcement or at launch, we don't know for certain.
And I'm just pointing out the we already have all of the information we need to conclude this definitively....and this tactic of saying 'we don't know until release' is just your way of having an opposite stance to take in the discussion.
Its not coming to Mavericks. 10.9.5 has already been through about half a dozen beta builds (maybe more). It will be launching around the same time as everything else. It does not include iCloud Drive, and will not include iCloud Drive. What's done is done. 10.9.6 will not exist....this is the last update to Mavericks.