S3 server is now cloaked back into S2 but it actually is S3 but a lot of people with S2 don't understand you can actually connect to S3 when Rockingham is not on so it's better to have the S2 name and on Tuesday/Thursday Rockingham can be voted for the true fans. S2 people get then automatically disconnected by LFS when the track loads.
So S3 is still there, it's just named S2 for the time being.
(I've read that another track release is going to take at least another series of months... Probably 2017... So... No reason to use the S3 naming that much while Rockingham is not running most of the time anyway)