Although designed to take advantage of the larger screen sizes of the Android 3.0 Honeycomb tablets the updated software works with Android 2.1 and later and is available now for free download.
Improvements include a new action bar at the top of the screen giving easier access to search, an option to "fly" to your location and layers for Places, Panoramio photos, Wikipedia and 3D buildings.
Photos from Panaramio can pop-up in front of a 3-D model
Although there is a lot of fuss about Honeycomb and n particular lack of app support for it this indicates that Android on tablets is more than Honeycomb. Perhaps the reason why there are comparatively so few Honeycomb apps is that you really don't need them. Android 2 apps perhaps with support for Android 3 features seem to b enough - well it certainly seems that way for Google Earth.