We've discussed this on lots of threads, but I've noticed a few things lately. They seem to be talking about the early days on a very regular basis, almost constantly. The change to FDS happens and this involved a dive into early history and a few knocks on Russell. Now the new tract according to another thread is discussing 1874 in it.
Seems like in the past they just tried to avoid that topic as much as possible. I could guarantee you only maybe five people or less in a hall would have any idea that 1874 was any significance to the JWs. Now the entire hall will if they pay attention.
With apostate internet info out there, it may be that they are talking about this stuff on purpose so that they get to be the way the message is delivered. A JW who knows about these dates already is much more likely to ignore the ravings of a mentally diseased apostate.