Images are not real time. Exactly how old I'm not sure, but it's not current. I was also under the impression a lot of the "satellite" data was actually taken from low flying airplanes rather then satellites.
Apple Maps has taken place of the google Maps app, so other than going to maps.google.com, which has different functions. Not sure. Some map apps use google data I believe, but don't sure which.
No idea on the walk around