I ran accross this "Hotsheet" a couple months ago, it is dated March / April this year:
Untitled Document
I was thinking the Fiesta had IOLM because of the following:
2011 Intelligent Oil Life Monitor (IOLM)
The new Intelligent Oil Life Monitor (IOLM) system will be available on over 90% of the 2011 Model Year Ford, Lincoln and Mercury vehicles sold. The system uses information from the Powertrain Control Module and an algorithm to calculate the proper oil change interval. The interval is calculated based upon the vehicle operating conditions.
The system uses the Message Center to display the messages below when the oil needs to be changed:
* "ENGINE OIL CHANGE SOON" at 5% oil life remaining
* "OIL CHANGE REQUIRED" at 0% oil life remaining
The oil change service interval can range from 3,000 to 10,000 miles depending on the vehicle operating conditions.
For further information, see the "2011 Intelligent Oil Life Monitor (IOLM)" Dealer Communication dated February 8, 2010.
FL-910 Motorcraft Oil Filter Upgrade - New Part Number FL-910S
As discussed above, many Ford, Lincoln and Mercury vehicles will begin utilizing the Intelligent Oil Life Monitor for the 2011 Model Year. This will increase oil and filter change intervals up to 10,000 miles or one year.
To meet this new interval, the FL-910 oil filter is being upgraded to FL-910S, incorporating a silicone anti-drain valve and other modifications to increase durability. The FL-910S will fit all applications calling for the FL-910. In addition, the FL-910S will be required for the new 2011 Fiesta launching in May.
For further information, see the Dealer Communication "FL-910 Motorcraft Oil Filter Upgrade - NEW Part Number FL-910S" dated February 22, 2010.
Perhaps the Fiesta requires this filter simply because of the improvements to it over the FL-910. Maybe the IOLM it just didn't make it to production in time and we'll see it later.