it has many improvements, many minor bugs has been fixed in this build, studiopress is releasing its updates of this parent theme according to the algorithm updates, to make it more Search engine friendly framework. in this edition this theme is more light weight and more responsive, & compatibility for all browsers has been added. Genesis 2.5 has its focus on the organization, integrity, and testability of code, along with other improvements for broad compatibility.

http://www.thetechex.net/genesis-framework-free-download.html