Night Elf Heroes

Arch-Druid

As one of the hero Night Elves, the Arch Druid's ultimate spell is "Force of Nature," which will transform it into a huge and powerful beast. The Undead also have a summonable super-beast (more on that later) which leads one to wonder if the Orcs and Humans will have their own.

Keeper of the Grove

With its centaur-like body (except it's half deer, not half-horse), the Keeper of the Grove is arguably the most interesting Night Elf hero. One of its featured spells is Nature's Touch. This spell allows the Keeper to either knock down trees instantly or regrow trees that have been chopped by peasants into stumps (the spell is context sensitive). Nature's Touch brings up a number of interesting strategies. Players might chop into an enemy base, attack, and then retreat back through the hole, with the Keeper sealing the way behind them. Or (assuming you've leveled up the Keeper and the spell to a high enough level) it may be possible for the Keeper to instantly create a hole in a treeline for a Night Elf invasion force to pour in through. Perhaps you could even imprison enemy peasants that have chopped deeply into a tree line by simply regrowing previously chopped trees behind them.

Look at the Demon Hunter - is that a bow or a bladed weapon?

Demon Hunter

The Demon Hunter is one of the Night Elves' most fearsome heroes. He carries around a weapon that at first appeared to be much like a Klingon Bat'leth, although it is in actuality more likely to be some kind of bow (basing this assumption on the Night Elves being mostly a ranged attacking race). Although his name and design suggests that he's only good for taking out Demons, the Demon Hunter utilizes demon-like magic and is good against all types of units. His abilities include Soul Siphon, which drains mana from an enemy and turns it into health for himself, and Flame Blades which can hit opponents for big damage. Additionally, the Demon Hunter can transform himself into a giant Demon for superior close-in fighting.

Correction - 11:00AM 04/05: OK it IS a melee weapon and not a bow. Rob Pardo wrote in with this clarification about the Demon Hunter - "[His weapon] is a long sword that splits into two other smaller blades. Flame blades is a fireball-like spell that does direct damage to a unit."

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Treants

The Night Elves have unique buildings that double as moveable units. When rooted into the ground, the Treants have their building functionality. However it is possible to uproot a Treant, which not only makes the Night Elf bases mobile (more so than Starcraft Terrans), but deadly as well. Uprooted Treants can attack for decent amounts of damage. Just imagine a huge oak tree uprooting itself and taking a swing at you, and you can see why attacking armies better bring extra invaders to the party if they want to take over a Night Elf town.