I think a great idea for a new course would be cryengine!
Why would this be a good idea for a course?
- Cryengine is 100% free, unlike unreal or unity.
- There is not much documentation available about cryengine a.t.m.
- It is a very powerful engine, just hard to get started due to lack of documentation.
I know cryengine is not that famous, but is a shame there are so few tutorials available for this amazing engine
EDIT: As Lumberyard is based on cryengine, and it is more recent, it might be a better idea to make a lumberyard course.