At BlackBerry World I heard a bit more about the BlackBerry PlayBook Android App Player beyond what RIM showed at the keynote we covered. Chris Smith, Senior Directory BlackBerry Development Platform, provided a little bit more info on what it means for developers. The main question developers have been asking is how they will package their apps.
RIM will be providing an extension for the Android SDK (Chris called it the Android Developer Source Kit) which will allow developers to simply repackage the Android app and sign it. In some cases developers will have to recompile the app then developers might need to adjust a few things to make the app work properly. What was really interesting was that all of the apps shown at the keynote were simply recompiled from the binary without access to the source code.
RIM also mentioned that the Android Player will be a standalone platform but repackaged apps will look the same as PlayBook apps with homescreen icons and emulated buttons. The platform will have access to low level features on the PlayBook like the Camera, Network, and GPS but not the rest of the RIM services like the advertising service or analytics. Apps that are developed with the Android Native SDK will not be able to use the Android Player but due to the POSIX compatibility many components of apps should be portable between the platforms.
Let us know if you have any other questions!