Lots of code examples in JS and Java (even though I believe a github repository would have been better than zip archives...), a $100M investment fund, and a real integration with their services and devices. Amazon seems to be really serious about this.

When Siri came out, I found myself wanting to build a service using it and got disappointed (even though the reasons not to open the API were obvious), so I'm now happy to see Amazon calling developers with a voice based API. I'd like to see how this will pan out.