Eight years ago, Tesla CEO Elon Musk promoted a next-generation Roadster, basing the name of the sports car on the company's debut electric vehicle from 2008. The updated version has yet to hit production. But Musk is again promising that a new one is on the way. In a discussion with podcaster Joe Rogan that was published on Friday, Musk was asked about the long-delayed vehicle. He provided a sense of timing but declined to share updated technical or design details. "I can't do the unveil