For Tesla fans, the company's next highly anticipated electric car — the Model 3, slated for release later this year — can't come soon enough. But CEO Elon Musk is already thinking about the next model. Musk being, well, Musk, teased a "Model Y" on Twitter. "Model Y is coming too in a few years," Musk tweeted. "Kinda have to." And that's all we know about the Model Y.