Hello Hary, thanks for posting your inquire at Intel communities.
I don’t have an official statement that the 3rd Generation processors are going to become EOL, however we continued to move forward to keep working with newer generation.
This new graphics driver for 4th Generation processors came out because it included some improvements on this graphics family. You would be able to get more information at the following link
http://downloadmirror.intel.com/24245/eng/ReleaseNotes_GFX_15_36_3907.pdf