A Linux version of Postal III was confirmed back in 2008, but with the Steam Linux client / Source Engine on Linux not officially being released yet, some have speculated that Postal III would fail to materialize for Linux. Some have failed to believe my reports that Valve is bringing Steam / Source Engine to Linux, even after a beta version of the Steam Linux client was discovered last summer.
For those that didn't understand my holiday surprise, it's still coming to Linux. As the latest of what I can say on the topic comes compliments of Hamish Paul Wilson, one of the Icculus members. Hamish had emailed Vince Desi, the CEO of Running With Scissors, regarding the Linux client for their Postal III title. Below is the e-mail in full from Vince.
Always nice hearing from the linux folks. As of today Yes we are still planning a linux release. We that is RWS are waiting for a final beta from our production team in Moscow. Like you and yours we are anxious and frustrated. I hate saying Shit [I'm] not sure about but I will share with you what I know. It looks like May if all goes well. We are hopeful to reach a distribution deal at GDC and worse case we go [direct download] and will find another team [for] Linux.
As it stands now, it looks like we will see the Source-powered Postal III game on Linux in or around May. GDC is the Game Developers Conference that's starting at the end of the month in San Francisco. More information soon.