No word yet on when it will be rescheduled for, but obviously we'll let you know as soon as we do. Until then, you can always console yourself by checking out what we expected to see at the event - namely, Android 4.2, the Nexus 10, and the Nexus 4.
Open GApps can now optionally install Google Assistant
These are all the apps and services that will work with Google Home [Continuously Updated]
[Update: May enable Google Assistant on non-Pixels] Google App v6.13 "alpha" appears with support for Payments on Google Assistant, and prepares enhanced Offline Search, Lite Mode, Recent page, and much more [APK Teardown + Download]