At this time I'm sensing the E-class has been canceled. There's some heavy rumors going on right now that lots of ICE models are going to be cancelled and EV launch dates have been moved forward.
Having an EQE and E class is not going to work, so you might have a point. And an ICE only next gen E class seems impossible to me in what, 2023? If there's a new E coming it'll likely be a facelift of the current just to keep the ICE-only markets happy. What Porsche seems to be doing with the Macan.