The SUV is growing in popularity globally, much of that after the model 3 decision point. It's going to be 75% the same, including the chassis, so sounds like the smaller SUV models from Honda and others that were designed Car-Up.
Per Quartz:
"SUV’s share of the global auto market has risen from 22% to more than a third since 2014"
"Musk predicted the Model Y would sell more units than the Model 3 and Model S, combined."
I think he's right; this is the first time I'm remotely interested. Still the Model 3 did well last year, and that's before the price drops, so I'd guess similarly good stats for 2019 sales:
"With some 140,000 units sold in 2018, the Model 3 was the best-selling electric car in the US last year...and the fifth best-selling sedan overall. The Model 3 accounted for 20% of the 700,000 mid-priced sedans...sold in the US in 2018."
https://qz.com/1573818/tesla-launches-the-model-y-suv/?utm_source=email&utm_medium=daily-brief