I just found out that the new Intel Macs have no support for Classic mode. Meaning that OS9 backwards compat is gone, over, finished. Now, this doesn't mean shit to me, since I don't use any Classic apps, and don't even have Classic mode installed on my Mac. But some people apparently still have these ancient abandonware programs that they consider mission-critical, which will never run on an Intel Mac. So with this particular facet of the move to Intel chips, a lot of diehard users will be left behind. Not that they're going to switch to Windows or anything, but it won't be the giant overnight switch Apple is pimping this as.
In Apple's defense, though, pimping ain't easy, and neither is adding some kind of crufted compatibility layer to the new OS.