The current filtering modes are only those supported by WIC. Some texture pipelines have implemented more advanced filtering, such as Kaiser filtering, which can produce higher-quality mipmaps.
Here is a GdMag article on the topic.
http://number-none.com/product/Mipmapping,%20Part%201/index.html
http://number-none.com/product/Mipmapping,%20Part%202/index.html
Here is a GdMag article on the topic.
http://number-none.com/product/Mipmapping,%20Part%201/index.html
http://number-none.com/product/Mipmapping,%20Part%202/index.html