Yes, that was my thinking. I guess it’s possible to have a single narrative arc that takes us all the way from level 1 to 20, but I suspect it would be easier to break it up and have a new, though hopefully linked in some way, story specifically developed for higher level characters.
You mean ... like having standard game for 1-12 ... where plot will be resolved and finished.
And DLC as separate story, lets say ... happening some time later, not directly related to main game plot, but coming out of it ... where you start at level 12 and go to 20?
Maybe even possible to play as its own game, without need of basic game?
Like ... Origins and Awakening? O_o
Now i feel ashamed i didnt even thought about that option!

That actually sounds great!
I can think of a number of reasons why the footage in the trailer might not perfectly mirror what we will see in the full release, and specifically why the characters shown might have been manipulated rather than have been “naturally” progressed through the game from the start
Indeed ...
But that was not really the question. :-/