This could be very handy.
Before people claim that this has always been the way, it was only partially available before, so this new app could really make a difference.

Google are releasing Voice Access, which will allow you to fully use your phone without needing to press anything. It has been created to help people who have difficulty accessing and operating their phones to use their device to a fully functioning standard.
Also, for those of you who can’t shake that strong local accent, resulting in communication problems with your smartphone but still want to avail of the hands-free option, don’t worry, there is a handy solution with this app.
Voice Access enables users to call out a number which will be partnered with the specific app you are requesting. As an example, ‘What is the weather?’ could be substituted by simply saying, ’41’, resulting in the same search.

As it stands, the app is in beta, but should soon be available to the general public.
Will it be useful?
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