Valve is expected to announce it will be adding Mac support for games on its digital distribution service Steam.
The developer has released a range of teaser images featuring Valve Properties such as Half-Life, Portal and Team Fortress mimicking familiar Apple advertising campaigns, according to MacNN.
These were accompanied with a press release from the firm's vice president of marketing Doug Lombardi, claiming the images were released in anticipation of an upcoming announcement from Valve.”
Rumours that Steam would be expanded to offer Mac support when users, reported by Kotaku, claimed they had discovered Mac OS X-compatible code and images in the service's latest update.
It is also possible Valve will be bringing some of its franchises to iPhone or iPad – many of the teaser images featured a small row of dots reminiscent of the iPhone's menu indicators.
Valve is most likely to make its announcement at next week's Game Developers Conference in San Francisco.