The WebM project is labeled “developer preview.” What does that mean?
Today we are releasing APIs, source code, and specifications that will be useful to you if you are a developer; they are much less useful if you are not. We hope developers will use what we’ve released to build WebM as a “preview” feature in their products. While we’re proud of our quality and performance today, there is more work to be done. The VP8 bitstream is final, but some features of the WebM format are not yet complete. We expect to achieve better visual quality and performance in an official release soon while also doing a lot more testing. You can help us get there by helping us tackle our roadmap.