Paladins cannot equip bows (or any ranged weapon, they use Librams in their ranged slotin the MMO). So no, you Paladin-lovers will need to complain a teensy bit more before you get a preview. :P
I believe it was stated that Warriors would be able to equip ranged weapons in the Flame Wrath preview, being used as a "strike-back" when your opponent attacks your Hero with an exhausted Melee weapon.
By similar arguement, this should allow rogues to equip ranged weapons as well.
No doubt that Hunters will get special bonuses from ranged weaponry. Look at Elendril's Flip power as a basic example. Also, look at Cleave for warriors, showing off their Melee weapon prowess.