I never check Facebook on principle so I wasn't aware of this. If it's true then I'd be very surprised. No idea who posted that but that person should have never done that.To quote the Terraria Facebook page, "As you likely have figured out, Terraria: Otherworld did not make its planned 2015 launch.
About the lack of communication, well, they're likely very busy. I can't blame them for that. They're also don't really have an obligation to us to share everything they do.
It's nice if they do ofcourse, can't deny that.