You have to create an account but it does not auto renew.
The coupon code is FREE PREVIEW.
After the free trial, you are asked to choose a package, according to the email I just received.
Thank you for activating the NBA LEAGUE PASS BROADBAND Free Trial.
You now have your courtside seat and can watch the action LIVE or ON DEMAND* during Free Trial. Visit LINK
to launch the NBA LEAGUE PASS BROADBAND player.
To watch games on your iPad, 7” Amazon Kindle Fire HD or Nexus 7, download the Game Time app, and then enter your All Access email address and password in the League Pass section of SETTINGS/INFO.
You can also watch League Pass games on your Xbox 360 (with valid Xbox LIVE Gold membership), AppleTV and ROKU. Just enter your All Access email and password into NBA Game Time Connected when prompted.
After the Free Preview has ended, if you want to continue to follow the action during the 2012-2013 regular season, visit LINK
to select your plan.