My Expectations :
Its Probably gonna be a more polished version similar to New 3DS or DSi (going to be called New Switch or Switch Advance or Super Switch)
Its gonna have an improved Joycons (hopefully with less drifting) a 1080P OLED Display, a better docking solution (instead of the current toaster one) and slight Improvement in the performance but not much
like, Dont Expect a 4K Quality (like some of the most ridiculous rumors ive seen lately) or even PS4 level of performance with the newer model, since Nintendo wants to Sell it at a Profit (with competitive Prices nonetheless)