We have not even begun testing on Lion.
I would not expect drivers from most developers for several to many months if the new OS is actually 'new'.. Some OS upgrades are more major than others when it comes to drivers. And some drivers may work just fine - but no one will really know for a while. Even testing by developers and the very intense stuff that MacGurus will do is not nearly enough to truly prove that a new OS isn't going to break things. Until tens of thousands of end users run it through every imaginable configuration and combination of hardware and software, it really isn't tested.
You would not catch me dead on a production machine running a new OS. A home or 'toy' computer, sure, no prob. But something I make a living on - no way. Not until it has been completely wrung out by the early adopters.
Rick
molṑn labe'
"I am a mortal enemy to arbitrary government and unlimited power. I am naturally very jealous for the rights and liberties of my country, and the least encroachment of those invaluable privileges is apt to make my blood boil."
--Ben Franklin