1. Is invisibility the only form of stealth or will we be able to hide behind a rock or tree with out a red dot on the mini map or our name tag giving us away?
2. Will there be creatures in the waters of ESO of both friendly and hostile variety, will we feel hesitation or fear about entering the water?
3. Is there a difficult and mysterious path to unlock a skill tree of the dragonborn, to grant a dragon in battles or as a mount?

1. I don't think we will have a red dot giving us away.

2. No idea yet either, good question though, and will there be a way to tell hostiles and non hostiles apart?

3. No dragons I'm afraid

1. Videos show no minimap and no name bars floating above people. They have a stealth system similar to skyrim

2. We do not know. There is no under water exploration at launch though.

3. No.

Hopefully no... It's so unrealistic in mmorpgs that "forests" are full of beasts and waters are full of sea monsters.