This doesn't read as any new information, but rather just analysis of the original story that the WSJ broke several weeks ago.
I do agree though that it seems more than likely that the 10pm hour goes away and will probably be replaced by more local news in most places, especially the small markets. For local stations, that's probably the best bang for their buck – no extra costs ("you've been producing half an hour, so we'll promote you to doing 90 minutes!") and a lot more ad inventory and therefore more revenue potential for the stations.
I doubt we'll see a late national newscast as so many have speculated in here. If NBC is going to give back the hour to affiliates, then they're going to give back the hour. I suppose some stations on the east coast could take the west coast edition of Nightly on a tape delay if they really wanted to, but that sounds kind of lame. At the most, maybe NBC would offer the option for stations to carry that Tom Llamas show or whatever else is on late on NBC News Now at that hour.
One idea I haven't seen brought up is whether the stations in the Central and Mountain time zones would be able to shift primetime to 8-10 and basically expand prime access to the 7pm hour and also still have a decent lead-in to the 10pm newscasts. If so, that would make programming neatly uniform nationwide with prime access until 8pm, primetime 8-10, and then local news at 10. If so, then this move would really work out well for the stations in the middle part of the country.
I would love to see some stations take this opportunity to do their own local late night talk shows. That would be fascinating, and perhaps some big market stations could pull it off. But I bet the cost-benefit analysis on that doesn't even get close to penciling out.