I'm not sure if this was turned on by default in previous versions of OSX, but if you are looking to get screen zooming using Ctrl+Scroll Wheel back, you can re-enable it by doing the following:
System Preferences > Universal Access (top right corner) > Zoom: On > Options... > And check 'Use scroll wheel with modifier keys to zoom'
It is super handy when you need to quickly check an image or color.
