At this stage as a graduate I am yet to see the promotion possibilities. However I have heard multiple times, from different sources that there is ability to move laterally through the business to find a position that allows for continued learning.
In terms of promotion opportunities, they are quite rare. I was fortunate enough to be promoted from my graduate program within just three months due to a team restructuring. However, in terms of career aspirations, the responsibilities and tasks you take on do prepare you for higher-level roles in the future.