Preview at WWDC likely in June, followed by September launch.
Google Maps for iOS in Alpha Testing, Partial Screenshots and Details
App Map [iTunes Link] developer Ben Guild has posted some early details and partial screenshots from Google's upcoming Maps application for iOS.
According to Guild, the standalone version of Google Maps for iOS is presently in alpha testing, but has some promising improvements over the old Google Maps. Guild reports that the new Google Maps is vector-based, has two-finger rotation to any angle, is "super fast" and supports the taller iPhone 5 screen.
The released partial screenshots aren't particularly revealing, but do seem to show that work is actively being done on the product. An early report claimed that Google may be targeting release by Christmas of this year. Meanwhile, Apple has been making improvements to its own Maps over time.