This is very early – so that might mean it will take a few days before all 2NLs are sent.
The email itself has no useful information. It simply tells you to check the ESC site for the interview details. Some people that receive the email will find the ESC site is not ready, those people should try again after a few hours. Also, some people find the email itself goes to a trash or spam folder or somehow miss it. So – if you think you may have been scheduled but missed your email, you can check the ESC site, just in case. The 1NL (you have been selected letter) is replaced by a new letter which gives the appointment details.
For those that received their interview notice, now is the time to start preparing for the interview. Gathering documents, scheduling the medical and so on. To learn how to prepare please view my guide on preparing for the interview.