Metamorphosis

If you use [item=131811] while in Metamorphosis it will look like you are flying in Metamorphosis with wings flapping and all. The dream of Metamorphosis-like flying without mount is alive.

Really wish Blizzard would make a Glyph that would make you be in this form at your normal height at all times or a Toy that let you change into this form for 5 minutes or so.

Worth noting: in Metamorphosis, you always get horns and tattoos (bright green). I made a night elf male without horns or tattoos, metamorphosised and I got the standard ones. Screenshots uploaded.

Tattoo style, but not tattoo color.

Worth mentioning you can't be imprisoned by your fellow demon hunters in this form nor the vengance one. I'm unsure if you can be banished by a warlock though.

For current lack of models on the website, here are two youtube links; Blood Elf Male Vengeance (https://www.youtube.com/watch?v=bJQuj1Akyvc), Blood Elf Female Vengeance (https://www.youtube.com/watch?v=w_xNCaoGTq4)

You can have this for 10 minutes. Get the toy in dalaran pet store for 1.000 pet charms. Get the toy from your garrison pet building for 500 pet charms. Use metamorphosis, use the toy to change your pet into your demon hunter form. Beware that a male demon form changes your pet into a female demon form. Then use the other toy to copy your pet appearence. If you are male you will be a male demon.

Most AoE circles used by other classes are canceled by right-clicking, but "Metamorphosis" is different. The AoE circle can only be cancelled by hitting Esc.

What is the reason that nobody knows the model ids for blood elf vengeance?

i realize this is an old comment, but in case anyone else is interested in this kind of thing: as long as you're in a group, you can also use a Reflecting Prism to swap your metamorphosis appearance to a group member, then swap it back to yourself. lasts 5 minutes each time but can be done repeatedly (until you run out of prism charges or stop being in a group)

The devs told us exactly how Havok abilities work in PvP at the link(s) below.

http://us.battle.net/wow/en/forum/topic/20747314610#2

I'm pasting it here as they typically delete the beta forums after release.

Metamorphosis leech reduced by 60% in PvP

Possible ways to reduce or avoid damage from falling. And also self-resurrection.

ITEMS
[item=32539] Slow fall.
[item=32538] Slow fall.
[item=18951] Slow fall.
[item=9404] Slow fall.
[item=131810] Controlled flight. / Can only be used in Broken Isles.
[item=37011] Instant fly mount / Requires Hallow's End (18 Oct - 1 Nov)
[item=33176] Instant fly mount / Duration: 14 days (real time)

TOYS
[item=134021] Launch up and slow fall.
[item=113542] Slow fall. / Cannot be used while moving.
[item=119093] Launch up and controlled flight. / Can only be used in Draenor.
[item=131811] Controlled flight. / Can only be used in Broken Isles.
[item=139773] Fly up and directed "jump". / Can only be used in Broken Isles.
[item=140336] "Jump" up. / Can only be used in Broken Isles.

CONSUMABLES
Goblin Glider Kit Controlled flight.
[item=104299] 50 charges / Launch far into the distance and avoid fall damage.
[item=104346] Can only be used in Timeless Isle. / Controlled flight.
(not tested)[item=90078] 3 charges / need level <100 / Any damage protection.
(not tested)[item=104320] 50 charges / need level <100 / Any damage protection.

POTIONS (Consumables too)
Potion of Slow Fall Slow fall.
Sea Mist Potion Slow fall.
Avalanche Elixir Avoid fall damage.
[item=8529] Slow fall (1/3 chance).
[item=43472] Slow fall / Can only be used within Storm Peaks (Northrend).

ENGINEERING
Flexweave Underlay Slow fall.
Goblin Glider Controlled flight.
[item=10518] Slow fall.
[item=40727] Reverse your gravity.

RACIAL TRAITS
Pandaren - [spell=107076] Reduces damage from falling.
Goblin - Rocket Jump Directed "jump".

SELF-RESURRECTION
[item=19290] 10% chance.
[item=104328] Only usable in Pandaria.
[item=163743] Only usable in Kul Tiras or Zandalar.
Soulstone Warlock.
Reincarnation Shaman.

CLASSES ABILITIES
Warrior
[spell=6544] "Jump" to location.
Charge "Jump" to target.
[spell=198304] "Jump" to target.

Paladin
Blessing of Protection Any damage protection.
Divine Shield Any damage protection.

Hunter
Disengage Directed "jump".
[spell=186260] "Jump" to target.

Rogue
Safe Fall Reduces damage from falling.
[item=77949][item=77950] Slow fall.
[spell=195457] "Jump" to location.
[spell=51690] "Jump" to target.
[spell=36554] "Jump" to target.
[spell=231718] "Jump" to target.

Priest
Levitate Slow fall.

Shaman
Reincarnation Self-ressurection.

Mage
Slow Fall Slow fall.
[spell=45438] Any damage protection.
Blink Directed "jump".

Warlock
Soulstone Self-ressurection.
(not tested)[spell=111771]+[item=132357] Cast portal and use it.

Monk
(nope)

Druid
Feline Grace Reduces damage from falling.
Flap Slow fall.
Travel Form Instant fly mount.
[spell=102401] "Jump" to target / Directed "jump".
[spell=106839] "Jump" to target.

Demon Hunter
Glide Controlled flight.
[spell=196555] Any damage protection.
Metamorphosis "Jump" to location.
[spell=198793] Directed "jump".
[spell=195072] Directed "jump".

Death Knight
(nope)