Here's what the website says,
Preferred Passholders - Renew Now and Save $80!*
Don't let your Annual Pass expire. Renew your 2-Park Annual Preferred Pass now and lock in the special low renewal rate of $99.95 plus tax.
You will continue getting an entire year of fun and excitement for about the price of two single-day admissions, plus a Universe of special Passholder benefits like free self-parking, food and merchandise discounts, special on-site hotel rates, NO BLACKOUT DATES and more!
Don't miss out on all the exciting special events coming your way throughout the year!
Annual Passholders can renew their passes at both Universal Studios and Islands of Adventure.
You can also renew your pass by calling 1-800-564-5764, Monday through Friday 8:30 am - 6:00 pm EST or Saturday and Sunday 9:00 am - 6:00 pm EST.
*Excludes Flexible Payment contract renewals.
I don't see anything about the 30 days though. I'm not sure where I heard that.