To be more specific, this will be the Version 4 of the course with a major upgrade to the `fastai` library (v2). There's an excellent talk by Jeremy (the creator behind the course) at Stanford that goes into the various layers that `fastai` library brings on top of `pytorch`:

https://www.youtube.com/watch?v=1TfI88uQNj8 (Please seek to around 30mins for the technical part)