By Luc Olinga Elon Musk has promised he will announce the locations of the next Tesla factories by the end of 2022. Tesla (TSLA) – Get Tesla Inc Report is the world leader in the lucrative electric vehicle market. And the Austin, Texas-based company is keen to keep its crown, which is coveted by the likes of Volkswagen (VWAGY) – Get Volkswagen AG Report, Ford (F) – Get Ford Motor Company Report, General Motors (GM) – Get General Motors Company Report, Mercedes-Benz (DDAIF) , BMW (BMW.DE) and the rest of the automotive industry. If its rivals are doubling down on projects, in particular by addi…