For years now, Google has produced a special network link file that shows the latest imagery that has been added to Google Earth. Each time they push out fresh imagery, the network link is updated (usually 2-3 days later) to show you exactly where the new imagery can be found.
To see it for yourself, just grab their KML file and look for the areas outlined in red as shown here:
You can also use this file to see the outlines of every previous imagery update going back to 2009 by expanding the “Previous Updates” folder in the file.
It’s important to remember that while the imagery is new to Google Earth it’s not necessarily brand new imagery. You can always find the date the imagery was captured by zooming in and looking for it in the lower left corner of the viewing window, as seen here:
Another thing to keep in mind is that the newest imagery is sometimes hidden in the “historical imagery” feature. This occurs when Google captures updated imagery for an area, but decides that the existing imagery is better (sharper, better coloring, etc). They still want to post the fresh imagery for users to find, but leave the better looking imagery on the default layer.
The entire process in which imagery is added to Google Earth is quite fascinating. I encourage you to read this post that Frank wrote a few years ago explaining how it all works.