Hi Adam,
I think advanced real-time rendering with Unreal Engine 4 would be great, especially now with Datasmith and V-Ray for Unreal. I'm generally interested in working towards visual parity between 3Ds Max and Unreal projects in the architectural world as we move to more real-time in 2019 as well as VR review of designs.
The update for your original 3Ds Max course sounds great as well. There's so much new material to cover in V-Ray Next and more to come it seems from their hints at future developments this cycle.
Best,
Paul