CS5 sneak preview

Content-Aware Fill
This feature is one of the good to know. Content-Aware feels, it can be used in two ways - with the Spot Healing Brush, or with a selection. In both cases, Photoshop examines the surrounding Repeated Expression pixels and tries to match both tone and lighting of the
Repeated Expression surrounding areas. While the Spot Healing Brush is improved in the quality of editing, the selection method is where you'll really see some magic happen.

Puppet Warp command:
If you know After Effects than then you Puppet tool. This tool available in Edit Menu, You can then use the Puppet Warp to place pivot points. The image can be gently manipulated along the pivot points—sort of like Liquify. There are some options to make the grid larger or smaller, to make the movements grander or more precise, and the movements less or more rigid.

Enhanced 3D:
The 3D features keep getting more useful to the designer and easier to use. A couple of new features include Repoussé, which extrudes flat selections into 3D objects, similar to the 3D extrude in Illustrator but more complex. The 3D meshes can be textured with any number of built-in textures.

Auto Lens Correction:
The Lens Correction filter can fix typical lens errors, (Like barrel and pincushion distortion, vignetting, and chromatic aberrations). The nice thing is the Auto Correction, which can do most, if not all, of the work for you. Don’t expect to do all the things by auto correction.

Enhanced HDR:
The adjustment controls are greatly enhanced, giving more options than previous versions. Another thing is Remove Ghosts setting that removes parts of the image that moved slightly when capturing the images. Another interesting feature is the HDR Toning option. This setting doesn’t require multiple exposures as true HDR does, but can mimic the HDR results.