Some highlights:
- support tab-completion in snaps, i.e a snap can ship a bash completion script and it will get exported to the users shell, details here9
- new snap whoami command
- new snap refresh --time option that displays information about refresh settings
- new snap tasks --last={refresh,install,remove,connect,disconnect,configure,try} option
- improve snap info output
- improve tab completion for interfaces
- go 1.8 fixes
- interface API improvements
- new interfaces: random, network-status, online-account-service, storage-framework
- interface improvements: browser-support, locale-control, dbus
- fix seccomp related core revert bug described in https://forum.snapcraft.io/t/snapd-2-25-blocked-because-of-revert-race-condition/722/61