Mikey Campbell, writing for AppleInsider:

Citing anonymous sources, MacDailyNews reports Apple plans to announce iMessage for Android at Monday’s WWDC 2016 keynote event, a move that could significantly expand the service’s footprint. The publication lacks a measurable track record when it comes to Apple product predictions, though rumors of an official Messages app port have been circulating for some time.

Grain of salt and all that, but this would be an incredible announcement.