According to wikipedia LP8 was mainly coca but included some carbon libraries, I don't know if this true but given the Logic team would have had forewarning that coca was the future for 64bit applications it would have been very shortsighted to do LP8 in carbon.
For those who expected a LP-64bit before or at the release of Snow Leopard, that would have been a very risky option for Apple. I used to beta test for Emagic in the late 90s so I know a little bit about software testing approaches. This is pure speculation but I doubt they would have bothered to test LP9 64bit with their external beta testers until SL was locked-off.
On another note I think there is a very strong likelihood that we should still be able to run 32 bit plugins in a 64 bit LP9 using Interprocess Communication.
A quote from Apples own 64bit porting guide, page 45 (
http://developer.apple.com/mac/libra...bitPorting.pdf)
"For example, audio software manufacturers may find it easier to drive adoption of 64-bit versions of their application if they also support existing 32-bit audio unit plug-ins.
Once again I should stress I have no inside information but I am quitely confident we will see a 64bit version of LP9 which we will be able to run 32bit AU plugs using IPC. Just give the hardworking beta testing team a couple of months of testing and I reckon by December I will be able to make use of all that RAM in my MacPro :-)
Cheers,
Scott