1. Does this work only for the beta event that lasts until tomorrow night or can it also be used for upcoming beta events?
ANSWER: works for all upcomming beta events.
2. I can create my own account and use it or it is your account only that it works with?
ANSWER: yes you can create your own account thats what the key is for.
3. How can I be sure to get the key and that it is working?
ANSWER: its been emailed to me from the survey i filled out, i have no interest in playing this game, all about that bf4 right now.