Petsets are alpha quality (lots of bugs and some missing behaviour in 1.3) and will only reach beta in 1.5, which is probably next year. So it wouldn't really be fair to demo something that cannot be used in production.

1.5 is in 3 months :)

But you're right it is alpha, and we would not recommend running production workloads on them.

Disclosure: I work at Google on Kubernetes