White now has access to more cards that synergize with the other main archetypes in the cube. The goal is to pull drafters into white for reasons other than just aggressive creatures and removal.
Green's 1-mana ramp options have been reduced and replaced with 2-mana variants. The goal is increase the difficulty of ramping out a 3-drop on turn 2 and also to add more synergistic variety to the ramp cards. To accommodate this change, green's creature suite has been re-tooled to reduce the number of 3-drops.
Black has received a power boost and support for a reanimator archetype. The reanimation has been limited to turn 3 in order to minimize non-games.
Changing the ramp package to reduce the number of 1-mana elves and boosting delirium.
Bringing white into the lands archetype.
The Aetherspark just looks cool.
Removing cards that have gone unpicked for several drafts, cards that are consistently powerful in ways that take away from other cards’ archetypes, and too many red 3-drops.