Google quietly announced on Google+ the latest version of the iOS version of the Google search app is out and it supports iPhone 6S 3D touch integration.

Google added:

3D touch integration on iPhone 6s devices – hard press on the app icon to bring up quick shortcuts for search, voice search, and image search.
Multitasking on iPad – use the Google app side-by-side with your other apps
Search results for places and local businesses now include holiday hours and info on the busiest times of the day to help you avoid the crowds.

Here is a GIF of it in action:

The Google Maps app for iOS was also updated this morning and it brought nearby gas prices as well.

Forum discussion at Google+.