Google is under the process of rolling out the update to their Maps app to version 7.5 which will be supporting Gmail integration, and also it is available for unofficial download via apk.
The Android Police Guys got their hand to the APK version of the app, but it is only compatible with the devices runnin on the Android 4.3 Jelly bean or higher. for fore information about compatibility with your device in the source link below.
Coming to the features of Google Maps 7.5, the main one is the integration with Gmail. Which will let you surf data like Hotel, Flight reservation taken from Gmail when users look for location relevant with that sort of information. In order to discover and use the feature, you will have to search locations that will be related to the upcoming events or travel plans that will be listed on your Gmail.
It is not yet available as when the official version of the updated app will be avaiable but you can always hit the apk file from the source link below, and also read about more about the new features that are to be added in the update.