Yes, I am very curious about his concept and I am glad that the Edain Team decided to adapt his BOTFA concept
1. Yes, of course, it will be a great link to the Hobbit trilogy and, since his concept will be the one of BOTFA, it is the most reasonable choice.
2. I support the idea of Tienety
Dáin, dismounted, without his helmet, with his red hair, has a 'wilder', yet more authoritative image.
3. Yes, I'm totally for it
Every king deserves his mount; Théoden and Aragorn have their own horses, the Witch-king has his own fell beast, Thranduil will have his own elk and Dáin must have his own boar.
A mount symbolises the superior status of a hero.
The Noldor are an exception, though, they are incredibly old and powerful in the Third Age, and Galadriel has her own terrible magical powers and doesn't need any mount
4. I wouldn't mind if they chose the boar from the film, anyway more wild boar than pig.
5. Two Handed Red Axe, it seems to be a more powerful and more dangerous weapon.
I prefer the Hammer though, I always see it more 'dwarven'.
6. Two Handed Hammer, see above for the explanation
Erebor Dáin.
1. With Raven Armour.
2. I don't like the shield on his character, it seems to slow down his movements and 'tied him up'; and I don't think Dáin wouldn't need a shield anyway
3. Hammer