VST 4 soon?

Is it anticipated that there will be a VST 4 SDK released in the near future and what might that entail?

MIDI 2.0 is a new set of protocols, anything else? Is there anything missing from VST 3?

no plan now for a VST 4, VST3 will be improved by adding some features.
For more info about MIDI 2 and VST3 you can check this presentation:
ADC 2020: Support of MIDI2 and MIDI-CI in VST3 instruments, Arne Scheffler and Janne Roeper
=> https://www.youtube.com/watch?v=zXnHaoN2Cig