Adding new cameras must be done through the Node Network at this time. Simply right-click an empty area of the network workspace, go to Create Other and choose Camera. In order to view or render through this new camera you will have to hook it up to a Renderer. You can create a new Renderer node in the same way. Only one camera can be hooked up to any given renderer, but multiple renderers can be fed by a single camera node.
To switch to your new camera after creating and attaching a render node, simply open the new render node's settings, then press View Camera twice (under the 3D preview window). This should switch you to the new camera view. Pressing View Camera twice will always reset the current view to the last selected camera/renderer, which is indicated by the last renderer settings you have opened.
- Oshyan