Not to mention that even if not covered by NDA, why announce so early - better for a big splash once you are near ready and just before release of device.
Currently all we got in terms of confirmations is the iWork Suite, Djay, popular VR game Rec Room, Microsoft Office, and Disney+. We can assume the other streaming services will get ports to visionOS, maybe Bigscreen will get a port, but the rest we don't know. It's too soon and we don't even have headset SDKs yet for VR developers. And even if we did, there's no guarantee they'd hop onto the Vision Pro with how closed it is when most VR developers would rather stick with developing for Quest.