The numbering system for development, which includes non-numeric symbols, doesn't really apply anymore because you never know when a developer isn't using the same system to indicate where development is at. There have been multiple cases of developers not following it on this site alone.
So, what this means for this game is that there are potentially not just three remaining updates in the development of the game, but as many as the developers actually need to get it done. It could go from 0.7 to 0.9 and then 0.91, or if really necessary 0.9001, however much more the game needs for whatever the developers have left to do. It does not have to immediately go from 0.9 to 1.0.