How is the multi-host networking implemented? Is there a dependency on a service discovery system? What service discovery system? Or are they using portable IP addresses? How are those implemented? Overlay networks? BGP? Or is it doing some crazy IPTables rules with NAT?

Will it work with existing service discovery systems? What happens if a container I'm linked to goes down and comes up on another host? Do I get transparently reconnected?

There's so much involved with the abstraction they're making that I'm getting a suspicion that it's probably an unwieldy beast of an implementation that probably leaks abstractions everywhere. I'd love to be proven otherwise, but their lack of details should make any developer nervous to bet their product on docker.