Silver to gold subscription upgrade questions

Hi everybody,
I would like to upgrade from a silver to a gold subscription, but I have a couple of questions.

I have a year silver subscription with expiration in Aug 2024 and I haven’t used my exam coupon yet, so my questions are:

  1. will I get an additional coupon for the exam (including the announced Senior Web Penetration Tester) or only the expiration date will be updated
  2. what happens to the remaining silver subscription period if I upgrade let’s say 27th Dec
  3. what will be the price for the upgrade

Thank you in advance and happy holidays