Your taijutsu is created by the steady study of the ten chi jin ryaku no maki program which contains all the basics of the nine schools of the bujinkan. All fundamentals have been regrouped into one single syllabus in order to give the beginners a chance to understand quickly what it is they have to learn and master.
But what is happening after you learnt the ten chi jin? You learn the schools, you learn the weapons, you learn the juppô sesshô. In fact if you look at it carefully you should see the first stage of your progression through the ten chi jin as the first circle of a metallic spring (see picture). Through the taihen kûden shinden succession we finish the first circle of learning and begin another one. This second cycle of learning begins with another ten but of a higher level.
Each circle is following the previous one and is linked to it. Life is similar, each action we take determines and/or influences our futures choices and actions.
To answer the original question as to know what is coming after the ten chi jin? the answer is always another ten and then another chi and jin, and so endlessly.