NVIDIA traditionally runs on a 2(ish)-year architecture update cycle with a "refresh" halfway through, featuring minor improvements (a little faster, maybe a little more memory). That's what Super is expected to be for the current GeForce generation.

More CUDA Cores, more RTCores (better ray-tracing) and in case of the RTX 2060 Super, you're basically getting a cut-down RTX 2070 with 8GB RAM and a 256-bit bus. Cheers!