Unless I'm missing something, those are the same flavor texts as the original Gates, and a quick glance at Orzhov seems to show the same raised letters. Clarification, anyone?
I'm starting to wonder if the hypothetical Dragon's Maze message is something like, "UNLESS NIV-MIZZET DOES SOMETHING ABOUT IT". Dragon's Maze's slogan is "Ten Guilds, One Destination", so presumably, the guilds survive until (and likely into) that set.
Then again, where would the message show up?
On the Dragon's Maze guildgates, of course.
Dragon's Maze Booster Packs All Contain Nonbasic Lands
That's better! The fifteenth card in all Dragon's Maze packs isn't basic land; it's nonbasic land. All ten guildgates will be showing up (with the Dragon's Maze expansion symbol), as will all ten shocklands from Return to Ravnica and Gatecrash (with their Return to Ravnica or Gatecrash symbols). You are about half as likely to open a shockland in Dragon's Maze as in Return to Ravnica and Gatecrash and, since this is for all ten shocklands rather than five, that means you are about a quarter as likely to open a specific one. There's also a mythic rare land from Dragon's Maze that will show up there sometimes!
This explains why the guildgates will have Dragon's Maze symbols but the shocklands won't. They need to have the Dragon's Maze symbol so we can read the new message. I hope it's the same flavor text; that would raise the cool factor by a factor of ten if they can get two messages in the same flavor text...
As of 4/18/2013, there are 8 of the DGM guildgates present on Wizards' Card Image Gallery http://www.wizards.com/magic/tcg/article.aspx?x=mtg/tcg/dragonsmaze/cig# and each of them have expanded artwork and new flavor text with raised letters.
On the Dragon's Maze guildgates, of course.
This explains why the guildgates will have Dragon's Maze symbols but the shocklands won't. They need to have the Dragon's Maze symbol so we can read the new message. I hope it's the same flavor text; that would raise the cool factor by a factor of ten if they can get two messages in the same flavor text...