Since the name is getting changed to OneDrive, I have a feeling that "OneDrive for Business for the mac" should be released soon.
This would be an ideal time for them to release a Mac Client.
They are getting ready to change the name to OneDrive (instead of SKyDrive), so, The "SkyDrive Pro" will be called OneDrive for Business, and the smart move would to release a Mac version on release.
We shall see soon