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Musk has already revealed some details about the project. Speaking at Tesla's annual shareholder meeting in June, the CEO said the automaker has been working with its "biggest customers" on the design of the semi truck, so they already know what the Tesla is making.
"They want to know how many can they buy, and how soon," Musk said at the time. He also said he "really recommend[s]" people show up for the unveiling, adding that "maybe there is a little more than we are saying here."
Musk had earlier said the semi would be unveiled in September.
—CNBC's Robert Ferris contributed to this report.