Playbook will support both Java and Android apps, RIM will also release a SDK for the development C/C++ app on the Blackberry Playbook OS.
As we had already told you that Playbook is scheduled to launch on April 19, Moreover Developers can run apps on BB OS due to API capability, Developers can develop apps and then submit Java or Android apps to BlackBerry App world and once approved users can download and use it.
BlackBerry Says :-
The BlackBerry PlayBook is an amazing tablet. The power that we have embedded creates one of the most compelling app experiences available in a mobile computing device today. The upcoming addition of BlackBerry Java and Android apps for the BlackBerry PlayBook on BlackBerry App World will provide our users with an even greater choice of apps and will also showcase the versatility of the platform.