From everything that ArenaNet has seemed to indicate, nothing in EotN was supposed to have been an answer in and of itself; everything has been clues pointing at what will be in GW2. The titan in Sacnoth Valley is likely meant to indicate that there will still be rogue titans showing up here and there in GW2; Justiciar Naveed's quests are meant to indicate that the mursaat will return in GW2. It seems likely that the facets are just meant to indicate the presence of something as well. The question is, what are they pointing to?
It doesn't seem necessary to suggest that the gods will be returning, so that doesn't seem to be what's being hinted at. It's possible that all ArenaNet is suggesting with this riddle is that in GW2, we'll be able to use the Rift as the interplanetary nexus the lore has always described it as. "Beyond the mists," might indicate the Mists, with the Rift at their heart, while "Beyond the dreams," might indicate the dreams so many have for entering the Rift and the Hall of Heroes there. "On distant shores of a land unwaking," might be as simple as just saying that we'll travel to a new world through the Mists if we can seize them in GW2.
This is a much simpler answer than I think most of us have been looking for (or, perhaps, wanted to find), and it really is about equal in revelatory power to the quests telling us that the mursaat and the titans are still around which, unfortunately, might mean that it's closer to reality.