Marble is rather self-explanatory. It lets you easily create realistic marble-like textures. There is a nice little checkbox that makes these textures seamless. This is definitely an added bonus if you are designing textures for web pages or creating texture maps for 3D applications.
Wood is another of the new filters and really self-explanatory.
It makes wood textures. I must admit that this filter is much better at creating a realistic wood texture than anything else that I am familiar with. It does a good job creating knotholes that look realistic. Drip is actually one of my favorite filters. It adds realistic drips to your selection.