Given that there's nothing new here but the announcement, it would appear this is a "drip, drip, drip" effort on the part of the Pentagon to keep this subject in the news.
BTW, the Pentagon has always made its news drops on this subject on Friday. Friday is of course "news dump day."
Of course, news dump day isn't just for stories the government hopes will just disappear down the drain pipe. It is also for stories the government (or anyone releasing them) hopes will be a topic of discussion over the weekend at home.
Moving the investigation to the Pentagon just means that the group will be closely supervised by a general officer instead of some O-6 marking time to retirement. It’s not like the Pentagon didn’t use past UFO scares as a smokescreen for aircraft development.