v0.3.1 (Aug 2017)

Improvements in C interop tools (function pointers, bitfields, bugfixes)
Improvements to Gradle plugin and dependency downloader
Support for immutable data linked into an executable via ImmutableDataBlob class
Kotlin 1.1.4 supported
Basic variable inspection support in the debugger
Some performance improvements ("for" loops, memory management)
.klib improvements (keep options from .def file, faster inline handling)
experimental workers API added (see sample)

v0.3 (Jun 2017)

Preliminary support for x86-64 Windows hosts and targets
Support for producing native activities on 32- and 64-bit Android targets
Extended standard library (bitsets, character classification, regular expression)
Preliminary support for Kotlin/Native library format (.klib)
Preliminary source-level debugging support (stepping only, no variable inspection)
Compiler switch -entry to select entry point
Symbolic backtrace in runtime for unstripped binaries, for all supported targets

Added support for coroutines
Fixed most stdlib incompatibilities
Improved memory management performance
Cross-module inline function support
Unicode support independent from installed system locales
Interoperability improvements
- file-based filtering in definition file
- stateless lambdas could be used as C callbacks
- any Unicode string could be passed to C function
Very basic debugging support
Improve compilation and linking performance

Initial technical preview of Kotlin/Native.