https://3speak.tv/watch?v=taskmaster4450le/quknmmqz
Master Plan #4 is in the works. This is something that Musk tweeted out that he was working on.

For those who do not know, this is something Musk started back around 2005 or 2006 when he released the first version. This laid out the plan for where Tesla was going.

In this video I discuss what might be in the 4th one along with how it could apply to a few of his companies, not just Tesla.