I don't think they've actually started it yet - just announced their intentions.
From how I understand it - eSET will be a web-based training resource. ESTA seems to have already started moving in this direction with ETCP. They recently announced that they're going to let people take practice ETCP certification exams over the Internet. I can't find a link to that right now, but it is mentioned on their Facebook page:
Entertainment Technician Certification Program (ETCP) | Facebook
I think you'll probably hear more about eSET pretty soon.