Yup, ESPN3 has a NASL game of the week. The NASL Live service is working well now and they have worked out the kinks the system had the first few weeks. The service uses local TV feeds from TV deals that 8 out of 10 NASL teams have so quality is quite good across the board. Youtube seems to be working well for D3 USL Pro though and I would expect them to continue with the free streaming. They're streams aren't as consistent or professional though and some are good and some barely watchable, but seems sufficient for them and can't see them moving to a payed service like MLS Live or NASL Live.
MLS is moving away from pay streaming, and will be outsourcing the streaming to WatchESPN and Fox Soccer 2Go next season.