Today Google released a new version of Google app for Windows Phone devices.
"The new Google Search app for Windows Phone. Find better results using Google from your Windows Phone. Search the web faster and easier with the latest features: Google Autocomplete, My Location, and Voice Search.
Voice Search: Search by voice and skip the typing
Google Instant and Autocomplete: Get search results faster
Search Nearby: Find places near you without typing your location"Google app is available for download from the WP Marketplace