Except the dragons in the game ARE intelligent, you know, that's why they have a language, I'd also imagine them to be a little on the arrogant side. I'd think that would come naturally with being a creature as large and powerful as a dragon. I doubt they'll have British accents, though, and I don't know about hoarding treasure. They seem to be pretty proactive when it comes to destroying cities, from what we've heard, but it doesn't mean they can't hoard treasure in their lairs.
Granted, they do have a runic language, you're right
I'd just very much like them to be more beast like, and it seems alot as if that's the direction Bethesda Games Studios is taking them. I always found the ancient skinny intelligent dragon that speaks to you in the voice of a learned old man to be well... Pansies, never once in any game where I've encountered that stereotype have I ever been "scared" of one, or nervous about how the encounter was going to end.
The only game where I've actually been skeptical about fighting a dragon was Dragon Age: Origins, those dragons didn't even speak, which I think made them much more animal like and frightening. They had other flaws though which I won't go into too much detail about.
My point is, Bethesda Games Studios' dragons are looking really animalistic and frightening, which I think is a huuuuuuuuuge plus and a massive improvement to the ripped straight out of D&D pansy dragon they had in Redguard. They have a language yes like you said, so they will be more intelligent than most other animals, but I still hope they won't make that their main draw. If that makes any sense?