Sept. 22, 2020—Today is the infamous unveiling of Tesla's Battery Day. Many are waiting to hear just what Elon Musk has in store for the forefront of electric vehicle technology. 

But yesterday afternoon, Musk took to twitter in an attempt to mitigate expectations for today.

Musk tweeted, "Important note about Tesla Batter Day unveil tomorrow. This affects long-term production, especially Semi, Cybertruck & Roadster, but what we announce will not reach serious high-volume production until 2022."

According to CNBC, after this announcement, Tesla shares sank 6 percent in after-hours trading.