After all, it's iOS and Android that are sucking market share away from RIM's devices. Reportedly, RIM will offer BlackBerry Messenger with reduced fucntionality on its rival platforms. Android and iOS might not be able to share photos or location, for example.
There is some degree of hope that users of the Android or iOS versions might be attracted to BlackBerry devices.
BGR says Android is definitely being worked on. Timing is unknown, just as with pricing. Howver, BGR's sources are pretty sure that the Android version will launch this year. Android's openness were the obvious reason that RIM took on Android first. Despite this, the plan is to build an iOS version as well.
You can watch a short video on BlackBerry Messenger below.