Looks like it could still be some time before we see the Persona Music Live DVD.
Currently the idea of such a DVD is still only listed under Atlus' "Project D" listing which, is a list of products that Atlus fans suggests to the company and petitions for to be produced. So far, the DVD is at the top of the list with just over a hundred signatures with the last being made early this month.
I don't know how good that is but, that's less than a tenth of the fans who attended the event. Lets hope it really is good enough to get the thumbs up from Atlus soon!