I have placed graphics on the map using sample code from here:
Get started with graphics | ArcGIS API for JavaScript
However I am looking to update the position of a point on the map at regular intervals and move the symbol. Is there a way to do this yet with v4.0-beta3 API?
I notice that there is no redraw method on the GraphicsLayer yet.
Yes you can update the location of a graphic in the 4.0 release of the API. You accomplish this by simply setting the new geometry on the graphic. redraw() is not required.
You can also create a FeatureLayer from graphics, which we recommend so you can take full advantage of the capabilities offered by FeatureLayer. See the description for FeatureLayer | API Reference | ArcGIS API for JavaScript 4.0 for more details.