Good of you to ask, TDD
!
1. Will weapons have procs?
2. Can you melee while mounted?
3. Can mounts cross water and climb mountains?
4. Will paladin buffs stack with the buffs of other classes?
5. Are there any skills that all of the tanking classes share, or do they all have their own flavour of, say, 'rescue'?
These are the things I'm most intrested in atm.
Have fun at Fanguard! Take lots of pictures if you can, so all of us who can't go can at least drool 8)!