It matters for planning. If I knew when the new release is coming, and which features it brings, then I can decide whether I use the current stable version, and upgrade later if required, or just use the beta version during the development knowing it will go live in time for my go live.

Knowing just that there will be some changes, but having no information about he final scope or timeframe makes the decision much harder to take, and can just lead to leaving to the competing product / language / library / framework with more predictable timelines.