Check it out on Google Video...
There are some interesting 'versioning' logic that is being implemented by Apollo, such as it won't need it's own Flash Player install, instead it will use whatever the 'system player' is currently. So, down the line, the Apollo runtime may leverage the Flash 11 Plugin.
Also, you will be able to specify a specific version of the WebKit runtime. So, let's say you build your app and only want to test it on a single HTML runtime engine, specify the number in your application and you'll never have to worry about new versions of Apollo having a negative impact on your application.