Sadly, Tesla doesn't share much, and it doesn't have a PR department to verify or deny claims. However, amid CEO Elon Musk's mentions of potential future expansion at the company's factory in Fremont, work has started nearby. Musk also recently commented that the Tesla Fremont team is kicking "butt" these days.
According to Teslarati, not only is there obvious construction work adjacent to the Fremont factory, but there also seems to be a lot of activity and "buzz" at and near the factory itself. The publication became aware of these details from a recent drone flyover video posted on YouTube by 在曠野遇見神 (Met God in Wilderness).