The epilogue is for the most part a series of cut scenes. Go to the Upper Castle in Rattay to meet with Margrave Jobst of Luxembourg and his associate John of Jenstein.
When the cut scene ends, speak with Sir Radzig.
The meeting with Jobst concludes this part of the story and establishes something of what is to come. Your last task is to ride with Lord Capon, but you will not be able to progress further once you reach the camp.