Looks like some announcements have already been made by other groups.
Anvil Rock - 4chan /vg/
Yak’s Bend - Yogcast, GW2 Guru, GameTrailers, Reddit alt?
Henge of Denravi - NeoGAF, Guild Wars Reporter
Maguuma - MMORPG.com
Sorrow’s Furnace - Reddit alt, VexX Gaming (PvP), Hearts of Chaos (PvX), GW2Den
Jade Quarry - PVP, Decisive Action (PvP), Lion's Arch Radio/Blue Isle
Fort Aspenwood - Penny Arcade
Darkhaven - Reddit (main), Reddit WvW, Oceanic alt, Almost Famous (PvP)
Vasburg - joO Binder (PvP)
Crystal Desert - (SouthEast Asia)forums.hardwarezone.com.sg, Reddit alt?
Tarnished Coast - Roleplaying, The Gentlemen's Club, rpg.net
Isle of Janthir - Boons & Conditions
Sea of Sorrows - SomethingAwful, (Oceanic), (Downunder/AUS/NZ)
Eternal Grove - Sea of Stars & Star Onions
Gandara - (English) Futilez (PVP)
Blacktide - (Russian) (Polish) (Dutch), Midnight Mayhem (PvX), guildwars.pl, GoHa.ru,Ancientz of Bronze Dragonflight, 4Gamers.be
Istan - MMORPG.com, Sweclockers, Ragnarok, (French) Luna Atra
Vabbi - 4chan/vg/, RockPaperShotgun?
Fissure of Woe - SomethingAwful, Reddit alt, (Italian) mmorpgitalia.it, TKOT
Underworld - Maltese Community, Reddit alt, 4chan alt
Ring of Fire - The Bulgarians (PvP), Facepunch?
Petrified Forest - Roleplaying
Jade Sea - NeoGAF
Whiteside Ridge - Reddit (main), GameTrailers
Fort Ranik - Reddit alt?, (French)JeuxOnline, (Dutch) 9lives.be
Ruins of Surmia - (Spanish) GuildWars2-Online.com
Sharp’s Corner - (Spanish alt) GuildWars2-Online.com
Aurora Glade - (Spanish alt) GuildWars2-Online.com
Riverside - Mixed
Elona Reach - (German) wartower.de, gw2.onlinewelten.de, guild- wars-2.net
Augury Rock - (German Alt)
Abaddon’s Mouth - (German Alt)
Signatures must conform to within 600px wide by 125px high.