The idea is to take forward the userspace-arduino project by implementing more libraries and adding more support.
It requires knowledge of how to access thinkgs like spi, i2c, gpio from the userspace. Take a look at libraries like pybbio, etc. to get a good feel. Another interesting aspect that can be implemented in this project is the inclusion of PRU. Last years GSoC took it forward quite a bit, and userspace-arduino could leverage that.
Anuj