It is 10% of your total purchase price with a 2,500 max for 6 months
It seems that Disney is making 2 seperate charges one for 2,500 and one for the rest you pay towards the initial purchase and the 2,500 get 0% for 6 months.
I would not bank on this as it is NOT what is suppose to happen.
I did gat the 2,500 with an add on recently which I knaw was a mistake but who am I to argue.