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.
Exclusive: This is the 2017 Google Pixel "XL," with low-bezel AMOLED display and squeezable frame
[Update: 5.3 released as stable] Exclusive: Nova Launcher finally gets Google Now integration [APK Download]
[Update: And it's back] Google has disabled the transparent UI for Hangouts on desktop