I checked sample code for ArcGIS 4.0 beta:
Samples Overview | ArcGIS API for JavaScript
First of all there are still a few samples. I tried zoom with Ctrl+Left Mouse button: it works as pan, but not as zoom in as in previous versions. Why ithis possibility was cancelled? Is there any other possibility for zoom?
Hi,
The navigation controls are documented in the MapView and SceneView class descriptions:
MapView: MapView | API Reference | ArcGIS API for JavaScript
SceneView: SceneView | API Reference | ArcGIS API for JavaScript
As of now, you can only zoom in by scrolling forward or double clicking.
It sounds like you're referring to the Shift + left mouse drag action that allows you to draw an extent and zoom to it. This action currently isn't supported in the 4.0beta, but it will be added in a future release.