Image courtesy WoW-Wiki
So, no doubt if you're a level 80 player and have been doing the Argent Tournament dailies for a while now, you're either exalted with a faction called the Silver Covenant or the Sunreavers.
But how much do you really know about these factions?
I personally think this is a huge lore-fail on Blizzard's part. I've not played my Hordie through the AT, but I must say, there was not a whole lot of background into the Silver Covenant on the Alliance side...
The Silver Covenant
This is a militant group belonging to the Kirin Tor. Led by Rhonin's wife, the famous Vereesa Windrunner, the main purpose of the Silver Covenant is to keep blood elves out of the Kirin Tor.
According to Project Lore, the blood elves of Silvermoon asked Rhonin to be admitted into the Kirin Tor, but those high elves within the faction, associating the blood elves with the betrayal of Kael'thas, formed the Silver Covenant to keep them out.
The Sunreaver faction, led by Archmage Aethas Sunreaver, is the Horde equivalent and polar opposite of the Silver Covenant. Their purpose is to gain entrance into the Kirin Tor for blood elves.
It is through the work of Sunreaver that the Horde was even allowed into Dalaran at all.
Both Vereesa Windrunner and Archmage Sunreaver can be found next to Rhonin in the Violet Citadel. Rhonin and the Kirin Tor itself have yet to make any official decision on the matter.
Both groups can also be found aiding the Argent Crusade at the Argent Tournament. However, the two factions continue to keep a healthy distance from each other.
Sadly, this is really all we know about the factions themselves. Hopefully, as the Argent Tournament grows, we'll learn more about them. But for now, the basic idea is:
Pro-belf in purple robes: Sunreavers
Anti-belf in purple robes: Silver Covenant
If anyone can point me to some more information on these two factions, please do! I really hope it exists...