> and the prominent featuring of those two products as a component of a whole new version of an OS makes it feel like a service pack.

point me to a page that only displays those 2 updates as the main features. In my browser Apple is clearly marketing the 64-bit, Grand Central Dispatch and OpenCL as the main reasons to upgrade.

Also stop referring to an OS upgrade as a service pack. Because it isn't. Microsoft releases service packs, just like Apple releases minor updates to their OS, (eg. 10.5.7)