they don't use current photos in most places. they do update areas after events like the tsunami and katrina/rita. they both got updates the next year.
they also are kind of careful about updating sensitive areas. remember the brits found google maps and pic on some if the guys they killed. brits figured that was how some of the targeting was so accurate.
i'm pretty sure i have a neighbor building behind me. wish they'd update my area! whatever he's building, it's probably illegal and most times i wouldn't care, but i really don't like this guy