The specific dates are October 30 to November 2 for Xbox One, and October 31 to November 2 for PC and PS4. To apply, you need to fill out the form here (or here, if you're on Xbox One), using the referral codes 08347-97365-66457 and EVOLVETOWIN, like so:
That referral code will improve your chances to get an invite, but it's limited, so make sure to apply ASAP if you're interested.
2K Games has also released a new trailer, which you can check at the top.
Questions? Comments? Contact the author of this post at andras-AT-kotaku-DOT-com.