Ruby cards focus on offensive strategies, like using the Rush (able to challenge the turn the character is played) and Evasive (only allowing other Evasive ability characters to attack the character) abilities
The Illumineer's Trove for Rise of the Floodborn is an impressive array of items
The "Might and Magic" Starter Deck is an Amethyst/Steel build and "Tactical Teamwork" is an Amber/Sapphire deck
1 Booster box contains 36 booster packs of MTG Conspiracy Singles #12
Maybe WotC was nervous about potential leaks, since they'd have to present those Final Fantasy cards to different parties ahead of time, but whatever the reason, the whole Commander set has been revealed weeks before the main set's full spoiler
The new set will also introduce Locations, a new kind of card, to the game, adding new rules and interactions to the game