From the HNTSA site:


FOR VEHICLES OLDER THAN 10 YEARS, ISUZU WILL OFFER A FREE REMEDY, BUT ONLY IF THE VEHICLE IS PRESENTED TO AN ISUZU SERVICE FACILITY DEALER WITHIN 12 MONTHS OF WHEN OWNER NOTIFICATIONS WERE ISSUED.
THE RECALL IS EXPECTED TO BEGIN DURING LATE JULY 2012. ISUZU OWNERS MAY CONTACT ISUZU AT 1-800-255-6727.
Looks to me like Owners of 10 year old vehicles will have until July 2013 to get to a dealer for a free fix.