Although Google has kept most of its secrets close to the chest, it seems an updated Google Maps may be announced today at Google IO 2013 based on a discovery by DroidLife. They discovered a special landing page that says
"tailored map for every search"
Based on the screenshots they provided, it looks much more like a mobile influenced design with WebGL overviews (taken from Google Earth), built in Flight Search and a feature to compare multiple modes of transportation on the same map.
We also see hints of Google Now style proactive recommendations at your destination (like restaurants). The site is no longer online but head over to Droid Life to see more screenshots.