On that note, Samsung doesn't telegraph concrete plans to their shareholders either, till they are confident about it. Samsung shareholders will know Galaxy S10 is in the works for 2019, but they won't know the exact price, release date and feature set, because Samsung Electronics themselves don't have that information yet. Anyway, all of this is irrelevant :)

There should absolutely be transparency, but only about things they themselves have knowledge of. There's transparency in their GitHub - it's easy to follow the development of Hivemind (the backend that drives Community) on GitHub. It's fair to announce that they are working on such a feature, and publish the specification (which again they have done to GitHub). However, saying something like "Communities will be ready Q3 2017" is naïve and self-defeating, and causes wholesale disappointment and lack of trust across the board. Instead, give out concrete details, including release dates, when you actually have the necessary knowledge to be confident about such a statement. Traders and shareholders alike will have far higher confidence in an organisation that delivers their stated goals on time and with the announced feature set.