What's the interface point by which I can utilise this "cloud" - is it providing an AWS like API, is it something standard I can tap into so I'm not "locked" into this just as much as I am my cloud vendor? Or is it all in on Kubernetes and I have to use that?
There is an API, on which we have also built a console, so you can use the API directly, use various CLI clients we've provided, or the console. Or you can sling JSON via curl, if you prefer.
If you want kubernetes, you'd run it yourself on top of what we offer, think EC2, conceptually.