The possible new model was revealed in a short scene that shows a large coupe-like sedan on the desktop of designer Evan Kingsbury, flanked by illustrations pinned around the workspace.
It is also possible that the vehicle shown is an early look at a new China-bound Buick model, which Holden is understood to be involved in designing together with GM partner Shanghai Automotive Industry Corp (SAIC).
The concept shown could in fact be the new model described by GM product chief - and former Holden boss - Mark Reuss in a Forbes interview as a "more beautiful Panamera".
Whatever the illustrated concept's identity, it is likely that a similar offering will come to Australia as Holden's new large family car.
Reports in recent weeks suggest that GM is planning to introduce a Chinese-built model as the Commodore's replacement in Australia - but the carmaker remains famously quiet on any talk of future models.
This latest 'development' follows the news that Holden will close the production lines at its Elizabeth vehicle assembly plant and Port Melbourne engine assembly plant by the end of 2017. Some 2900 workers will be directly affected by the closures, with approximately 1600 in South Australia and 1300 in Victoria.
Holden's decision will also have a flow-on effect to Australian-based parts suppliers, who must now scramble to diversify their businesses in order to stay viable beyond 2017. Many, however, will be forced to shut down.