KEP: Topology-aware service routing by m1093782566 · Pull Request #640 · kubernetes/enhancements
interesting kube proposal (that seems unimplemented so far) that wpould allow configuring of services to prefer node-local (or zone-local) pods. This could drastically reduce cross-zone data costs.
Resizing Persistent Volumes using Kubernetes - Kubernetes
resizing of persistent volumes is possible from 1.11, although expanding the overlaying filesystem still requires a pod restart. Online resizing of the filesystem is in alpha though, so hopefully that'll be a thing eventually