yeap NBOpenGL relied on NativeBoost and our new FFI is UFFI so that means that NBOpenGL does no longer work and there are no plans to make it work at least for now. The problem is that Nativeboost was doing machine code stuff that were difficult to maintain and so it does low level stuff with NBOpenGL.
UFFI however is very similar to Nativeboost, so porting OpenGL to it is certainly much easier than rewriting the whole wrapper. Obviously OpenGL being huge wont be a walk in the park , however the good news is that NBOpenGL was automating the process with auto generating wrappers.
If you wish you can do the porting to UFFI and Esteban will be willing to answer questions oh how can make it work. Esteban is the man behind UFFI and our full time dev of Pharo.