I personally am not worried that there will be any more damage than in previous years.
In the 1999 competition particularly, there were a lot of scuffles between robots over the control of the puck (a large octagonal raised platform on castors). Truck Town Terror comes to mind
As far as I know however, there were no major issues regarding robot damage and such. I suppose whether the competition goes into "Battlebot" mode depends on the robot drivers.