In my post yesterday I noted the increased push by the Wave developers to make it easier for the wave community to build and deploy extensions. It turns out this flurry of activity coincided with the imminent release of Version 2 of the Wave API, announced today.
The first new feature is the:
Active API: In v2, robots can now push information into waves (without having to wait to respond to a user action). This replaces the need for our deprecated cron API, as now you can update a wave when the weather changes or the stock price falls below some threshold. You can learn more in the Active API docs.Google Wave Developer Blog Announcement.