You will be guaranteed to have your season ticket price frozen for 5 years and if Cardiff did get promoted this season then you will get your money refunded.
The offer was open to the first 10,000 that applied before the 3:00pm deadline today. There have been reports that over 8,000 people have taken up the offer (there is an interest free option with payments only starting in January over 5 months), and that 1,000 people joined on Dec 30th.
There are just a few hours left to get yourself signed up either in person at the ticket office or via the call centre on 0845 345 1400. You can also do it via the e-ticketing system.
For full details click here to visit the official website.