I'm at the Apple Store...
Here we go, doubters.... and why would I want to remove my serial, just out of interest?
and like pjashley1 shows on his screenshot, it is definitely ENABLED on the MB 2.4 I'm picking up right now, (I'm having my data transferred over from my MacBook 2.16 presently)! I also confirmed this with the Apple Store Manager. My specs:
# 2.4GHz Intel Core 2 Duo
# 2GB 667MHz DDR2 SDRAM - 2x1GB
# 250GB Serial ATA Drive @ 5400 rpm
# SuperDrive 8x (DVD±R DL/DVD±RW/CD-RW)
# Keyboard/Mac OS - U.S. English
# AirPort Extreme Card & Bluetooth
Also, remember to ADD the Apple REMOTE, 'cause it doesn't come pre-loaded in the box anymore!