Buildpacks have become the way to standardize the setup of your stack in a PaaS. In some areas of PaaS, buildpacks may become displaced by Docker images and Dockerfiles, but for now they are the best and most portable option for PaaS and the majority of the PaaS ecosystem is standardizing on them.
Last month I spoke with Ben Golub, CEO of Docker Inc. We briefly discussed service discovery and how it relates to Docker. A close cousin of Docker is etcd, since etcd and Docker seem to swim in the same circles.
The PaaS landscape is changing. Many of the anticipated shifts are yet to come. Most of the expected changes are based on predictions of what the big players should do to align themselves for a prosperous future.