I initially tried to log into PTS2, and received the "no Character Slots" message. I then saw Khrolan's tweet about deleting PTS1 Characters, so went to delete the two I had there, but then found that while PTS1 is "Open" status, the connect button is greyed out and I am unable to try and connect.

I can still click connect for PTS2, though that still gives the error of no character slots available.

This feels like how it used to work for Fresh Start vs. Legacy server selection, if that's any help!