SOny just released the price for the ps4 protection plan:
U$ 49.99 for 2 years AFTER 1st year expired (manufacture's warranty) => total 3 years
U$ 59.99 including accidental plan
http://us.playstation.com/support/protection-plan/pricing/index.htm
I just called them to confirm: psn plus subscriber will not get a discount for now.
You have up to 30 days AFTER receiving the console to sign up for the accidental plan. However, if you are looking for the regular plan, you can sign up within 1 year of purchase.
Accidental plan will cover problems like USB port malfunction, etc..., which Sony considers as physical damage. Given that information, I think it is better just to sign up for the accidental plan just to be on the safe side!
ANd yes, you can pay via phone or via PSN. And yes, you can use your PSN wallet money to pay for that!!
I hope that helps guys!!