Another thing to keep in mind with subsequent vehicles is that the Gigafactory won't be fully completed until 2020. And, for fiscal reasons, I suspect Tesla will need to wait until Model 3 production starts before announcing Gigafactory 2.
I think that puts a Model Y launch in the 2019/2020 timeframe, assuming no issues with Model 3.
I think that puts a Model Y launch in the 2019/2020 timeframe, assuming no issues with Model 3.