Toyota's RAV4 and Corolla models being surpassed by Tesla's Model Y in global sales rankings indicates a shift in consumer preferences towards electric vehicles. This could have a negative short-term impact on Toyota's stock price as it highlights the increasing competition in the automotive market and the need for Toyota to adapt to the growing demand for electric vehicles.

The news of Tesla's Model Y becoming the world's bestselling car is a significant milestone for the company, showcasing the growing demand for electric vehicles and Tesla's strong market position. The upgraded Hardware 4 self-driving setup also adds value to the Model Y, potentially attracting more customers. This is likely to have a positive short-term impact on Tesla's stock price.