Forgive my ignorance, but where is everyone getting the evidence that Hermaeus Mora is involved in all this? I dont remember his name or realm being mentioned when people were poking around in the patch files?
If you know the lore, then the trailer says all. Other than that: the coding in the patch files says HM Daedra (or something as such)- it was a process of deduction from there. And once the image of the "Dragonborn mask" came... the assumptions came in harder. And finally, when the trailer showed, it wreaked with Hermaeus Mora. If you've ever seen what HM looks like, you'll understand the connection. All tentacles.
Yep, plus, if you've read the description of Apocrypha in the book called "http://www.uesp.net/wiki/Lore:The_Doors_of_Oblivion", it
makes even more sense when comparing that description to the trailer. There are shots in the trailer
of a weird otherwordly realm with books all over the place, which matches the description of Apocrypha
pretty darn well.
So I guess it's safe to say that it is 99.99% sure that old Herma-Mora is in this one.
Gee... Just thinking about it fills me with glee and happiness! I can't wait to meet my favourite Daedra!