Content-Aware Fill - enables you to remove an element from an image and automatically replaces it with a background that matches the scene in tone, lighting, and noise of the surrounding area. You can use Content-Aware Fill with the Spot Healing brush or as an option of the Fill feature to replace content in an active selection. When used with the Spot Healing brush, it will account for more of the content and structured detail providing for a cleaner result. This feature works best on areas where there is plenty of sample content for Photoshop to interpret the background from.
HDR Pro - will allow you to take bracketed images – images shot at multiple exposures - and then combine them into a single image that is able to capture the full tonal quality of the scene. There are also extended controls that will allow you to adjust your image from photo-realistic to totally surreal. For High Dynamic Range (HDR) to work correctly each image shot must be non-moving and so usually requires the use of a tripod, but sometimes even with the use of a tripod, something in the scene may be moving, like a wire or a tree. This can result in ghosting. HDR Pro has a feature that allows a single image to be a sole reference and by brushing over the object that contains the ghost, the ghost is eliminated.
HDR Toning - gives you the ability to create an HDR image from a single shot instead of a series. It is for those times where you were not able to create a bracketed image, but you still want to enhance the tonal qualities, the new HDR Toning will give you the ability to mimic the look of an HDR result quickly and easily.
Mixer Brush - gives you drastically new painting qualities from within Photoshop CS5. This new brush gives you the ability to define multiple colors on a single tip and then mix and blend them with the underlying hues on your canvas. You can start with a blank canvas, or you can use a photo original to blend the colors, giving the image a painterly look. There is extensive control over the wetness of the canvas colors as well as if the brush is refilled, cleaned, or a combination of both after each stroke.