RIM just released the Playbook Native SDK 2.0 Beta 2 and you can download it.
What’s the changelog?
* Device Detection – Working with connected devices is now easier, device and simulator are auto-detected while adding a target.
* Improved Deployment Setup Wizard – The deployment setup wizard has been streamlined to ease the setup of your development environment.
* AIR Native Extension Support – New workflows have been added to the IDE to help you build and debug native extensions.
* Per Project SDK Support – You may now configure your SDK on a per-project basis. For example you could have one project in your space build against the latest release SDK (1.0.8) and another build against the latest developer SDK (2.0).