and the standard reps probably wont have a clue
1) The trial hasn't started yet.
2) We don't even know if any ISPs have yet opted in - or even been accepted to opt in as it's still too early. The opt in decisions are taken at a much higher level than CS/TS and we as consumers have little influence.
3) It will be on a ISP basis and not by line - backed up by the number which they anticipate will be on the trial. Sometimes they do a by line basis trails which is usually restricted to say staff members and that figure is a lot less than 100k .
If they opt in, then we will find out eventually in a month or so.
As Carl has already said the DLM works on profiles which does allow for specific ISP profiles. The easiest way I can think how to compare it which you may understand, is similar to how an ISP can select 'Speed' or 'Standard' and that then becomes default for all their customers.