Watch the HD version: • Adobe Photoshop CS4: Pen Pressure
In this video I demonstrate the improvements to pressure sensitivity. It is not a new feature, but I feel that it has been improved.
This is for Graphic Tablets and Tablet PCs only as a mouse cannot use pressure sensitivity. Photoshop will now detect pressure more easily and apply it when painting.
If you have a tablet (and this version of Photoshop) you will see (and feel) the difference it makes. In my opinion, I feel that I now have more levels of darkness/opacity/flow etc. when using a tablet whereas before it was either dark or light.