Probably, the 0.5.5 feedback thread vanished. That happened last time shortly before an update released.
OT: probably nothing happening at all :| Then again, the last update was exactly a month ago, so it's just about update time...
Do not use SteamDB to predict things. It is almost always an automatic update. It is like saying "That traffic light is Red, so the Labour Party will win the next General Election".