Wednesday's regular feature on the mothership, Uncharted Realms, is usually used to tell side stories to the main plot, which aren't required to understand or enjoy the overarching story. Typically, we get snippets of the background of main characters, or the consequences of larger events. This week's Doug Beyer-authored Uncharted Realms, however, The Gorgon and the Guildpact, has a lot to do with the future of the main Magic storyline.
Since Doug Beyer is responsible for writing so much of Magic's story, we can assume that the information in The Gorgon and the Guildpact is canon, and will be taken into account in future events. Without going too far into the details, the crux of the story is the actual showdown that's the impetus for Duel Decks: Jace vs. Vraska, where Vraska tries to force Jace to abuse his authority as the Living Guildpact. The key portions are this:
With a shriek, [Vraska] blasted them all back. Then she took a breath, closed her eyes, and planeswalked away.
"She'll lay low for a while," Jace said, rubbing the welts on his neck. "It should buy us some time, I hope."
Vraska hissed, suddenly close behind him, and Jace felt a tendril touch his ear. "How fortunate for Ravnica," she snarled. "Are you going to protect it the way you protected Kallist? Or Kavin?" She had certainly dug deeply into his past. He wondered what else she had found out about his life, and what her sources could be. "And what about Garruk Wildspeaker?"
"I've made mistakes, yes. But I choose to use my position to atone for—wait, what about Garruk?"
Vraska snorted. "You don't know what's become of him, do you?"
"Why? What's happened?"
"Never mind. I'm sure you've already failed him as well."
He gathered his cloak around him. "The Guildpact is supposed to keep people safe," he murmured. "But I've only brought them more danger. And I think something's up with Garruk."
"Someone I may not have failed yet."
Yes, Vraska has left Ravnica for the foreseeable future, because she's put in a rather compromising position by Jace's revelation of her identity and crimes to a summit of the guildmasters - including plans to assassinate every single one of them. Meanwhile, and more importantly, Jace is off to help cure his old friend Garruk This probably we means we'll see the green and blue members of the Lorwyn Five in a block together in the near future.