On Oct. 9, Musk tweeted that Tesla would reveal on Monday a product that was "unexpected by most."
Recode reported that it was possible Musk planned to unveil a new version of the company's at-home energy storage devices, called the Powerwall and the Powerpack, as he'd promised by the end of 2017.
Another possibility was the launch Autopilot 2.0, an updated version of the company's semi-autonomous driving system, Recode said.
On Sunday, Tesla and Panasonic announced a collaboration on the manufacture of photovoltaic cells and modules in Buffalo, New York.
Under the deal, which will only go ahead if shareholders approve Tesla's takeover of SolarCity, Tesla will make long-term purchases of PV cells and modules from Panasonic for use in a solar energy system that works with the Powerwall and Powerpack.
Panasonic will start production in Buffalo to meet Tesla's requirements from 2017, the companies said.
Tesla offered to buy SolarCity in late June, but the deal has been criticized for a variety of reasons, such as being a poor use of Tesla's cash or a distraction for Tesla executives.
Musk has insisted that SolarCity's business would complement Tesla's stationary storage products, such as the Powerwall and Powerpack, helping the company to provide a fully integrated, sustainable energy system.
--CNBC's Phil Lebeau contributed to this report.
Correction: This story was revised to correct typos in Tesla.