Explanation of details of the engraving, eh ? That's the kind of thing the lore people will want to save on UESP or something. Especially since it all ties every game together. We don't learn anything new especially, but that is still very cool.
Makes you wonder, though. If Skyrim is sort of the culmination of previous games, maybe it hints that the sixth instaltment will deal with entirely new matters. I mean, they can't just make the characters say "oh wait, I misread that verse there, in fact Alduin itself heralded a bigger danger", that's just silly. So yeah, TESVI - new stuff ? They do speak an awful lot of Akavir, one can dream.
*Getting ahead of myself*