The announcement was just a new drama CD. Now we're back to season 2 never ever.
DANG, that's a huge hit to fans of Rokujima (I'm probably going to check it out at some point, actually). But to be honest, that's not even the biggest bait and switch I've ever heard of with an anime, manga, or light novel with a "major announcement"... in fact, the guiltiest offender I've ever heard of came up earlier this year, and that's Moriarty the Patriot.
-October 2018, it was noted that there was a "new project" in the works.
-November 2018, that "new project" was revealed to be nothing more than a character popularity poll.
Seriously, like... WTF? I don't follow Moriarty, but that's... I don't even have words. Building up hype only to reveal a character popularity poll? That's worse than building up hype only to reveal a drama CD or a pachinko / pachislot. That's something that even any dedicated fan of their favorite franchise wouldn't do if they suddenly got control of it. It's just... like I said, WTF?

What I'm saying here is that it could have been much worse. I feel bad for the Rokujima fans (I'm likely to become one myself soon), but on the other side of the coin, some franchises will from time to time end up victims of a REALLY nasty bait and switch like what Moriarty got. A big tease leading to a drama CD is MUCH better than a big tease leading to a character poll is what I'm saying.