I've seen a lot of arguments that, if Larian released weekly/monthly "what we're working on" announcements, then the community would get vitriolic at things the community doesn't agree with. But, c'mon, the forums are already pretty salty. I doubt it would be worse.
I would love "what we're working on" announcements, but I can also see why they wouldn't do it. If Larian said they were working on something and then later had to cut it, it would open them up to accusations of lying, etc.