Most of the features in the gallery are convenience features (music room, image room, vision and event replays) for easy access to content available in-game. The Profiles are actually still WIP and are likely to see another few revisions before they become public. We also have the character playlists section available in the public build. I keep the short stories exclusive to our patrons for now because it was one of the longstanding perks for pledging high. I have plans for certain short stories to eventually become public anyway, so it's just a matter of patience. As for the concept art and bonus features section, those are intended to be exclusive to our Patrons until further notice.
As far as I know, the only unlock notifications in the public build should be for the playlists and chapters. If you've encountered one for a short story, that's actually a bug! The notifications were added in at a later time when most of our players already had the features unlocked, so I'm not surprised this might have fell through the cracks. I'll take another look at the code for those, so thank you for bringing it to my attention.