My thoughts led me to think that maybe Speechcraft now includes an understanding of languages. Everyone knows Cyrodiilic, and Dragonshouts cover Dragonish, but what about the giants (confirmed) and other intelligent creatures (such as Daedra). It would make sense to me if the Speechcraft skill included perks to learn and advance your knowledge of languages, opening up deeper options when interacting with races that don't natively speak Cyrodiilic.
Also, could they included the Caste system again? Reintroduce upper and lower classes, playing off Daggerfall's Streetwise and Etiqette skills. These could all be included within the Speechcraft skill too.
I think if these (and potential other) ideas were reintroduced then Speechcraft would be worth investing into, and would open up role-playing options.
Any thoughts and ideas (again, assuming it's in, we don't know the Skills lists yet so this is all speculation)?