Just found this article that sounds really promising: http://www.engadget.com/2014/09/18/NVIDIA-Maxwell-flagships/.
This is the interesting part that is actually relevant to GI: “[FONT=Segoe UI]Finally, high-end maxwell cards will be able to take advantage of games that use Voxel Global Illumination, a new dynamic lighting technology that promises to promises to enable destructive environments with active, realistic lighting. How realistic is it? Realistic enough to debunk moon-landing conspiracy theories[FONT=Segoe UI], actually. NVIDIA says the new lighting solution will be available for UE4[FONT=Segoe UI] and other major engines later this year.”
Not sure if that means Epic is working on implementing the solution and it will be available to us as part of the engine within a year or if that means Epic will be able to implement it in a year. Would be nice to know if Epic has any plans with this or if this is news to them too.