It seems like RIM is using the Android player in PlayBook OS 2.0 to bring some companies to the BlackBerry 10 platform. Kayak stopped developing their BlackBerry smartphone app but now @AlexKinsella at RIM pointed out that Kayak has ported their Android app to the PlayBook. The app is definitely not a native app but this is all part of RIM’s onboarding strategy for developers and apps on BlackBerry 10. I personally feel like all of these content portal apps will be HTML5 shortly so bringing them natively to the PlayBook will be even easier then.
Check out Kayak.com for the BlackBerry PlayBook in App World