Cubase Pro 8 upgradr from Cubase AI 6

Firstly, I want to change the country in my profile under your main site now that I have a new address in the states.
Secondly, I have a cubase AI 6, now that version 8 is available what can i do, and what will it cost me to upgrade? Please, Let me know if i need to send my eLicense code for confirmation.