...Hermanous Mora showing show in his true form? Anything at all?

Nope.

I doubt Herma-Mora will show up as anything besides some weird orb or something.

Also, Daedra have no true form, they just are.

I am hoping it will at least appear, and in its preferred form of a mass of tentacles, a la Call of Cthulhu: Dark Corners of the Earth.

As do I, though, I expect the tentacle anmations to be crappy.

Snakes and tentacles are a pain in the as to prgram the movements for and it not look like crap.

They weren't that bad CC:DCE were they? To be honest I haven't played that game in over ten years.

No, there's no specific information about quests. Look at the "proof" links, that's all the data that was added:

http://www.gamesas.com/topic/1417392-18-beta-update-solsthiem-dlc-hints-thread-9/page__view__findpost__p__21660925 http://www.gamesas.com/topic/1417392-18-beta-update-solsthiem-dlc-hints-thread-9/page__view__findpost__p__21660876 http://www.gamesas.com/topic/1417175-18-beta-update-solsthiem-dlc-hints/page__view__findpost__p__21656816 http://www.gamesas.com/topic/1417057-time-for-some-spoilers-form-the-latest-beta/page__view__findpost__p__21653361, and http://www.gamesas.com/topic/1417092-hints-found-about-the-next-dlc-found-in-18-beta/page__view__findpost__p__21654653 for dragon riding. Also, http://www.gamesas.com/topic/1421192-18-updatedragonborn-dlc-discussion-thread-43/page__view__findpost__p__21749310 for the CK Update.

The tentacle anims are most likely for the Black Book, as you enter HM's realm Apo-whatever, and they don't svck -- they're quite cool

That's too bad. I still hope HM makes an appearance in its preferred form and not just a "void."