* **Support for HCL Config Files:** Consul now supports HashiCorp's [HCL](https://github.com/hashicorp/hcl#syntax) format for config files. This is easier to work with than JSON and supports comments. As part of this change, all config files will need to have either an `.hcl` or `.json` extension in order to specify their format. [[GH-3480](https://github.com/hashicorp/consul/issues/3480)]
* **Support for Binding to Multiple Addresses:** Consul now supports binding to multiple addresses for its HTTP, HTTPS, and DNS services. You can provide a space-separated list of addresses to [`-client`](https://www.consul.io/docs/agent/options.html#_client) and [`addresses`](https://www.consul.io/docs/agent/options.html#addresses) configurations, or specify a [go-sockaddr](https://godoc.org/github.com/hashicorp/go-sockaddr/template) template that resolves to multiple addresses. [[GH-3480](https://github.com/hashicorp/consul/issues/3480)]
* **Support for RFC1434 DNS TXT records:** Consul DNS responses now contain the node meta data encoded according to RFC1434 as TXT records. [[GH-3343](https://github.com/hashicorp/consul/issues/3343)]
* **Support for Running Subproccesses Directly:** Consul agent checks and watches now support an `args` configuration which is a list of arguments to run for the subprocess, which runs the subprocess directly without a shell. The old `script` and `handler` configurations are now deprecated. A `-shell=false` option is also available on `consul lock`, `consul watch`, and `consul exec` to run the subprocesses associated with those without a shell. [GH-3509]
* **Sentinel Integration:** (Consul Enterprise) Consul's ACL system integrates with [Sentinel](https://www.consul.io/docs/guides/sentinel.html) to enable code policies that apply to KV writes.