What's happening in Portal right now is subtle and mysterious. What's happening with Valve's teasing of a Mac-related announcement is quite the opposite. Valve has begun sending out a series of teaser images themed with Mac-related imagery and starting their well-known characters from Half-Life 2, Team Fortress 2 and Portal. It's all adding up to...something...that I'd guess is being announced very soon.
There have been indications recently that Steam is headed to Macs. These teasers seem to suggest not only is Steam getting a Mac client, but Valve's catalog could be headed to the platform, too.
Want to see what we mean? Check out these images that are circulating various sites now.