A bi weekly dev blog would certainly help improve communication, and give players something to digest. The Project Zomboid devs have been publishing dev blogs for years and it's a great way to keep people engaged and informed about the many hiccups they encounter during production.
And on occasion they will not only reveal screenshots, but the occasional video as well, often showing the bugs they encounter (some are very entertaining!) but screenshots as well. But only when they feel confident such screenshots or videos will accurately display content players will receive.
And the battle terrain system is going to be a huge update, I personally would love to see some images or videos as they compete individual maps. But only when those maps are ready, because as you said, people will read all kinds of wishful thinking and raise their expectations about what can be delivered.