To cut a long thread short, there had been some discussion on the fact that in the beta, there is currently no way to gain reputation with the factions that supply valor point gear, apart from doing daily quests. The factions do sell tabards, but these are purely cosmetic and award no reputation gain from doing dungeons or raids or the like. So the only way available to increase your reputation with the four factions is via completing their quest lines and daily quests.
The four factions in question are The August Celestials, The Klaxxi, Shado-Pan and Golden Lotus. All these factions offer different gear slots, recipes, patterns and mounts, with some overlap -- and of course this is beta, so there's likely to be more gear added in. At the moment, this is the only gear available in exchange for valor points.
Understandably, this has caused some negative reaction among players who don't really care for questing and dailies and prefer to do enough to buy a tabard and run dungeons to gain reputation. Those players asked Ghostcrawler why Blizzard is "forcing" them to do daily quests by removing reputation tabards from the game. See his response after the break.
The TL;DR version is as follows: In The Burning Crusade, earning reputation with different factions was too difficult. Blizzard inserted tabards to make it easier; this made it too much easier and removed faction identity. They've put a lot of work into the daily quests, and they hope you'll like them and see them as a fun alternative to running dungeons. This is all part of their grand plan to provide more endgame content for players.
It's open warfare between Alliance and Horde in Mists of Pandaria, World of Warcraft's next expansion. Jump into five new levels with new talents and class mechanics, try the new monk class, and create a pandaren character to ally with either Horde or Alliance. Look for expansion basics in our Mists FAQ, or dig into our spring press event coverage for more details!