Mine has had the squeaking, and the popping, too, when backing out of the driveway while turning and going over a bump. The squeaking was easy to duplicate, especially over smooth bumps. The popping was occasional. (27,000 miles)
Brought it to the dealer with a printout of this TSB. They said they didn't hear it too much during the test drive, but performed the work listed on the TSB. Replaced swaybar links and nuts. Covered under 36,000 mile new car warranty. Fixed.
2009 Focus SES,
Vista Blue, ABS/ESC, Moon & Tune