Hidden Guildgate Message (spoilers!)

Return to Ravnica: THE GUILDS OF RAVNICA
 
Azorius    T I F I
Izzet      H L R C
Rakdos     E D A A
Golgari    G S V
Selesnya   U O N
 
 
Gatecrash: WILL DESTROY EACH OTHER
 
Orzhov     W E Y O
Dimir      I S E T
Gruul      L T A H
Boros      L R C E
Simic      D O H R
 
 
Dragon's Maze: UNLESS THE MAZE IS SOLVED AND THE GUILDPACT REBORN
  (lowercase letters are unconfirmed)
Azorius    U A D L R
Orzhov     n z a d n
Dimir      l e n p
Izzet      E I D A
Rakdos     S S T C
Golgari    S S H T
Gruul      T O E R
Boros      H L G E
Selesnya   e v u b
Simic      M E I O

So, yeah, the Guildpact is probably going to be rewritten.