The final release will be greater than 10 levels...so 11+
I imagine they are working out the final classes and companions before trying to finish the story...beyond story-boarding that is.
In parallel with releasing new classes, they are smoothing out game-play and fixing bugs.
When the last class drops and feedback is received, then I can see them finishing the story.
I would also wager that the areas are progressing quickly in the shadows (building the stage).
