[pubsubhubbub] PubSubHubbub and Google Calendar

[Danny Briere]

Does anyone have any visibility into the adoption of PubSubHubbub by
Google Calendar for change notifications?  The application is an
external application that wants to know anytime there is a change to
any event item in Google Calendar.  Google Calendar has an RSS feed
for this, and I would have thought by now that they would have adopted
PubSubHubbub.  Brett, anyone in the know?