Google is holding a media event on June 6 related to their mapping services (Google Maps in this case).
The invite states: The next dimension of Google Maps.
Looks like we might see a brand new version of Google Maps launched at this event. Maybe a 3D enabled one.
The timing of the event is interesting. It is scheduled to take place just days before the WWDC where Apple is expected to announce their own mapping service that would replace Google Maps in iOS 6.