For the topic on the number of Alliance mounts versus Horde:
The quick way to check is at
http://www.warcraftmounts.com/
Just click the alliance mount link. At the bottom, it'll say how many mounts are available. Same for the hoard. Currently, it lists a total of 159 for each faction to potentially use. That number includes class specific mounts, WoW TCG mounts, removed mounts, and dropped mounts, near as I can tell.
For those of you with your tinfoil hats on out there

I'll list all the faction specific mounts, not counting quested/faction mounts like the Winterspring Frostsabers for the Alliance, nor any of the Argent tourney mounts. Its easy enough to see we have equal numbers there right now. I'm just sticking to the basic Core Faction mounts, because that is where the discrepancy used to be
Alliance
Brown Elekk
Gray Elekk
Purple Elekk
Great Blue Elekk
Great Green ElekkGreat Purple Elekk
(6 total Exodar)
Brown Ram
Gray Ram
White Ram
Swift Brown Ram
Swift Gray Ram
Swift White Ram
(6 total Ironforge)
Blue Mechanostrider
Green Mechanostrider
Red Mechanostrider
Unpainted Mechanostrider
Swift Green Mechanostrider
Swift White Mechanostrider
Swift Yellow Mechanostrider
(7 total Gnomeregan)
Brown horse
Chestnut mare
Pinto
Black Stallion
Swift Brown Steed
Swift Palomino
Swift White Steed
(7 total Stormwind)
Striped Dawnsaber
Spotted Frostsaber
Striped Frostsaber
Striped Nightsaber
Swift Frostsaber
Swift Mistsaber
Swift Stormsaber
(7 total Darnassus)
33 total core alliance mounts
Horde
Black Hawkstrider
Blue Hawkstrider
Purple Hawkstrider
Red Hawkstrider
Swift Green Hawkstrider
Swift Pink Hawkstrider
Swift Purple Hawkstrider
(7 total Silvermoon City)
Black Wolf
Brown Wolf
Dire Wolf
Timber Wolf
Swift Brown Wolf
Swift Grey Wolf
Swift Timber Wolf
(7 total Orgrimmar)
Brown Kodo
Grey Kodo
White Kodo
Great Brown Kodo
Great Grey Kodo
Great White Kodo
(6 total Thunder Bluff)
Emerald Raptor
Turquoise Raptor
Violet Raptor
Swift Blue Raptor
Swift Olive Raptor
Swift Orange Raptor
(6 total Darkspear Trolls)
Black Skeletal Horse
Blue Skeletal Horse
Brown Skeletal Horse
Red Skeletal Horse
Green Skeletal Warhorse
Ochre Skeletal Warhorse
Purple Skeletal Warhorse
(7 total Undercity)
33 total core Horde mounts
As you can see,
both races have 33 core faction mounts they can get. In BC and beyond, Bliz was careful to make sure that any additional faction based mounts added to the game were equal on both sides. Both factions have an equal number of initially obtainable flying mounts. Both factions have an equal number of PVP mounts they can obtain. Both factions have a long quest/reputation grind for an additional mount (Winterspring Frostsabere versus Venomhide Ravasaur). Each individual race has 2 additional mounts obtainable at the Argent Tournament. There are many, many other dropped mounts and reputation mounts in the game that are not specific alliance or horde, and are obtainable by both.
So, at the end of Wrath of the Lich King, Horde and Alliance are equal, mount wise anyway.
Come Cata ? Goblins, and therefor the Horde, get 6-7 additional mounts, and unless there's a secret mount vender added to the game before then, the Alliance doesn't. After all that hard work in wrath to balance out the number of mounts, I find it odd that Bliz would unbalance it.
So, why does this matter ?
Several reasons:
1. More mounts make it that much easier for the Horde to get the 50 and 100 mount achievements, as well as any other future mount achievements, such as a 150 one. It may not seem like much, but City reputations are easy to grind, and when you're one mount away from one of the achievements, tell me having your character's faction being short 6-7 mounts isn't a big deal. It is.
2. I'm with Mania and those wanting Worgen specific mounts. I want more cool mounts to ride. More mounts are more fun, and provide motivation for players to get exalted with Gilneas.
3. It doesn't make sense. Worgen will have to have the riding skill anyway to fly. They'll have to use mounts to fly. They're originally humans. Many of the people in/from Gilneas are still human. Hell you even ride a horse in one of the Gilneas quests to rescue a guy hanging in a tree(been a while since I saw the quest, I don't remember the details). Why don't they have mounts ? On a side note, if Running Wild should let me fly, then I demand to have tracks of fire, alla Back to the Future, behind me if I have 310% flying and use Running Wild
The only options I've thought of so far that'd make any sense would be to:
A. Give Worgen a faction specific mount selection.
or...
B. Make the Goblin Trikes avalible through Steamwheedle Cartel Rep. They're goblins. They love gooold.