You can currently set up a video conference on the Google Meet (Hangouts) app, only with a G-Suite account. Individual account users can only join a video conference. Something you should keep in mind.
The interface is clean, which is very much like Google, and the controls are clear and easy to understand.
As it stands, the Google Meet (Hangouts) app is a visible upgrade on the standard Hangouts app and the transition is definitely worth it.
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Google Chat
The second app that will replace the Hangouts app, is the Google chat app. Built for enterprise-level group chats, Google Chat has a layout that is similar to the very popular Slack app.
You have the ability to send messages to individual accounts, just like Hangouts, while the group feature has been integrated and further refined.