Archtypes, themes, synergies, deckbuilding and environment in general.
The Article. (http://www.boatbrew.com/magic-the-gathering/2015/7/9/limited-lab-magic-origins-limited-overview-themes-and-environment)
2 sample Sealed pools (http://www.boatbrew.com/magic-the-gathering/2015/7/9/maelstrom-pulse-sample-prerelease-sealed-pool-analysis) with 2 possible decks for each of them.