You can start playing with Minko 2 from now on because its first public beta is available on Github. Minko1 was already a powerful engine/tool, but Minko2 goes even further with more speed and features.
Its rendering pipeline is now faster, showing an impressive(insane?!) +3000% performance boost in the best cases. It also has a simple API to program the GPU. The complete list of new features you can check here.
Head to Github and start testing now! As soon as Minko2 is released, I will update the Minko entry here on the site.