Stage3D Extended Mode

As far as I remember there were some new Stage3D extended mode features added with some AIR 3.x beta release but I wonder if they made it into official release or not. The features I`m talking about were MRT (multiple render targets), increased AGAL opcode count, AGAL conditionals and loops and rectangle textures. All I can find in the documentation is API for creating rectangle textures (by the way - why it is AIR only?). So - were all those other additions beta only or is API reference site just lacking some info?