According to Macrumors, a reliable source who has provided some reliable information about Apple's software plans in the past has revealed that the big Apple will be bringing Siri to Mac devices in the form of a simple Siri black and white icon that features the word "Siri" surrounded by a box in the menu bar, as well as a more colorful full dock icon featuring a colorful Siri waveform. Last but not least, Siri for OS X can be activated either through these two buttons, or via a hands-free "Hey Siri" activation command.
Siri for Mac is expected to be revealed next month during Apple's WWDC event, while the intelligent personal assistant will be launching alongside OS X 10.12.