First and foremost Hi!

This is my first post in this forum so please excuse me if I'm asking about things already discussed, I have used the search feature but didn't find a specific thread that sums up everything. So here some IMO important questions on vampires in Skyrim:
We don't know anything about vampirism in Skyrim, there is no information available on it (except that you drink from sleeping people), but based upon past TES games:
1. Can characters of all race types become vampires? If yes, are some of the races better suited for being vampires?
2. Is there a change in appearance reflecting vampirism and does it scale depending on how long you have been a vampire?
1. Yes, but it's more difficult with races that are resistant to disease.
2. Yes your appearance changes, no it has nothing to do with when you got vampirism.
3. Does being a vampire affect in some way the main quest-line and does it affect the relations with NPCs?
4. Can you drink blood from individuals belonging to all the races in Skyrim? Can you drink animal blood? Is there a difference in blood quality depending on who do you feed from? Is it necessary the target to be alive in order to drink its blood?
3. No direct effect on the main quest, plenty of effect upon general NPC interactions.
4. Yes to all races, probably no to animal blood, probably no to quality. Probably yes to the alive part.
Bethesda has indicated that blood drinking in Skyrim works similar to how it did in Oblivion - you drink from sleeping people.
5. Is there specific vampire equipment in the game, or the vampires use the ordinary weapons, armor, shields that you can find anywhere? (I strongly hope there are unique vampire items, at least in terms of appearance if not in abilities as well).
Ordinary items, you still have hands and body in roughly the same shape everyone else and use the same tools. Conceivably a few unique items could be banned from getting equipped by vampires or burn vampires who equip them.
6. Being a vampire can you recognize (sense) other vampires? By recognizing I mean some other ways different than checking out their fangs length. Unless you've been caught svcking blood (btw can you be caught?) can NPCs tell you're a vampire?
Probably not able to sense other vampires, or not much easier than a non-vamp could - if they're secret that would disrupt any plot/quest about them being secretly vamps, if they're not secret you can probably tell without being a vamp. Presumably you can still get caught like you could in Oblivion.
7. Is there a way, through potions or other, to walk in daylight?
In all prior games the rate of sunlight damage was low enough that you could easily continually heal it with restoration spells.
8. Is there a specific vampire skill tree/perks?
Probably not much of one.
9. Is all magic available to use by vampires? Are there spells/abilities that only vampires can use?
Probably yes to both. There were vampire-only spells / lesser-powers in Oblivion and Skyrim and Daggerfall IIRC.
Hopefully these are general questions and are not spoiling too much, knowing more details can prepare us better should we decide to walk this path.
Bethesda simply hasn't said much on that subject, and so far as I know no one outside of Bethesda who has played Skyrim has managed to become a vampire. We'll find out soon I guess.