Going off of previous games, releases from approximately 90% to the end come in 1% intervals, not 2%. It’s really a matter of how much stuff they still have to get into the game for the last update to bring it to 100%, as opposed to releasing precisely 2% of the game per update.
Yes I've noticed that too, I suspect it is because they have started working on the next game by then so are splitting there time between two projects.