I've updated to Xcode 6 beta 3 and see that the [+ = -] buttons in the storyboard corner are gone. Is there a way for me to zoom in and out on view controllers within a storyboard in Xcode 6?
You can zoom the storyboard by double-click canvas or using top-menu(Editor > Canvas > Zoom).
Alternatively: Right click blank space on canvas and choose zoom level (allows to zoom out further than double click)