
TorchAudio - Major improvements to I/O, including defaulting to sox_io backend and file-like object support. Added Kaldi Pitch feature and support for CMake based build allowing TorchAudio to better support no-Python environments.
TorchText - Updated the dataset loading API to be compatible with standard PyTorch data loading utilities.
TorchCSPRNG - Support for cryptographically secure pseudorandom number generators for PyTorch is now stable with new APIs for AES128 ECB/CTR and CUDA support on Windows.

Please note that, starting in PyTorch 1.6, features are classified as Stable, Beta, and Prototype. Prototype features are not included as part of the binary distribution and are instead available through either building from source, using nightlies or via compiler flag. You can see the detailed announcement here.
TorchVision 0.9.0
[Stable] TorchVision Mobile: Operators, Android Binaries, and Tutorial