86) there will be no invisibility in any ways. You will have to use obstaсles (bushes, trees, landscape features) to hide from enemy or stay behind him. So ye, in theory you will see everyone miles away.
87) Peacefull crafting, your own small shed, small garden, alot of hunting (since you'll have to travel really far to stay alone and away from major guilds and alliances). It's just another way of gaming, try to shift you way of thinking away from WoW levels, mob farming and battlegrounds arenas.
88) World will be 21,5 * 21,5 kilometers = 462,5 sq.km. It's up to players to have crusades or whatever they like to do - we won't force something like that with game mechanics or scripts.
89) Pretty much like it was in real world - shileds>ranged, speed (cavalry)>ranged, range>rest.