Done. Google Maps for iOS has just been made available. From the official description: "Navigate your world with Google Maps, now available for iPhone. Get comprehensive, accurate and easy-to-use maps with built-in Google local search, voice guided turn-by-turn navigation, public transit directions, Street View and more. Use Google Maps to discover great places to eat, drink, shop and play, with ratings and reviews from people you trust. Sign in to save your favorite places and quickly access all your past searches and directions from your computer, right on your phone."
MacRumors offers an entry named Roundup of Features in Google Maps for iOS: Better Design than Android Version, iPad Version Coming. Which includes: