The SDK now includes support for a comprehensive set of Pepper interfaces for compute, audio, and 2D Native Client modules. These interfaces are close to being stable, with some important exceptions that're listed in the release notes.
"In addition, we've focused on improving security. We have enabled auto-update and an outer sandbox. This allowed us to remove the expiration date and localhost security restrictions we had adopted in previous research-focused releases. Beyond security, we've also improved the mechanism for fetching Native Client modules based on the instruction set architecture of the target machine, so developers don't need to worry about this any more," said Google.
Until the ABI becomes stable, Native Client will remain off by default. However, given the progress we've made, you can now sticky-enable Native Client in Chrome 10+ through the about:flags dialog. Otherwise, you can continue using a command line flag to enable Native Client when you want to.