I think you mean the dynamic GI they talked about at GDC15, that was Heightfield GI and as far as I understood it, it’s a totally different deal. So no worries there ^^ I remember that they had distance field GI as well, but that’s limited to one bounce as far as I remember and I’m not sure if it’s the same thing or not.
With Epic’s DFGI and Heightfield GI (assuming they are different techniques, like I said I’m not sure), Nvidia’s VXGI, and 's GI solution, we would end up with 4 GI solutions. I think that would be great, since they work differently they might have different pros and cons, so everyone could choose which one he wants to use.
Buuut that’s just a thought 
Greetings,
Dakraid