Just flagging this issue, as there doesn't seem to be any clear answers, even though Leopard's shipping date was announced today.
I understand that, in fact, all versions of Tiger came without Mac OS 9 system folder for use with Classic.
How it seemed to operate, as in my case, was that Migration Assistant picked up the OS 9 folder from the old computer and this action enabled the Classic control panel in Tiger's System Preferences.
The question remaining to be answered is whether the Power PC version of Leopard will allow Classic to operate
in similar way. Or, in fact, will the final Leopard RC for Power PC even ship with a Classic control panel in its System Preferences?
For those of us who keep legacy applications on the back stove or for those of us who need to work with Classic on a regular basis, for the vast productive Power PC user base still very much alive and kicking Apple should provide a clear answer.