Just a personal opinion but with the investment made in the SL drive system (battery, controls, motor, etc..) we're unlikely to see a real upgrade for a couple of years. Maybe an uplift inbetween, but with supply chain issues in the world likely to be minor to accommodate availability of components. Possibly different frame colours. But the main uplift, like other things, will likely be the price I'm afraid Would be more than happy to be proved wrong though!