Nice, but ... webm needs to get hardware support (ie so it can be played from smartphones, tablets, raspberrypi etc), until then it's doomed to irrelevance.
Most of the main chip makers seem to have agreed to support it [1], but it's taking too much time to bring it to their chips. For example in 2014 I'm not going to care about wide VP8 support anymore. In 2014 I want to already see wide support for VP9, since VP9 is the next-gen codec.