Recent updates with Hangouts include a feature that overrides the automatic speaker-driven switching in a video call. Now users have the ability to select a participant to be shown as the default for all other participants so that the screen doesn't change to different people during presentation modes. For more information on this update, see Improved presenting in Hangouts video calls: Present to everyone.
Google has also announced that people using the Hangouts apps on Android and iOS will now be able to participate in multi-way video calls without a Google+ profile. For more information on this update, see Multi-way video calls for Hangouts on Android and iOS without a G+ profile.