Genius move by RIM: no one really wants to build apps for BlackBerry, and PlayBook isn't even here yet so I guess there are even fewer people interested in that, so how can RIM get more content which is the most important thing in any platform? Use something which is already there!
Since both BlackBerry and Android are using Java for the applications, it's relatively easy to make a Java app which was developed for Android, run on PlayBook.
Here's a part of the press release:
RIM Expands Application Ecosystem for BlackBerry PlayBook
- BlackBerry PlayBook to support BlackBerry Java and Android apps
- Native C/C++ development support added, in addition to HTML5, Flash and AIR support
- Support from leading game engines: Ideaworks Labs (AirPlay) and Unity Technologies (Unity 3)
BlackBerry PlayBook becomes a new market opportunity for all the developers who have already created over 25,000 BlackBerry Java apps and more than 200,000 Android apps.
Looks promising and very rich in terms of alternatives, but I just hope the path itself won't be too difficult (migrating Android apps, interacting with device API's etc.- those can sometime be more important than having a wide range of development tools).