Mike and Dorian sat with us in a room dedicated to the process, and went through all our items
(2013-04-15) If you cast a split card with fuse from your hand without paying its mana cost, you can choose to use its fuse ability and cast both halves without paying their mana costs
Tempo-focused gameplay with counterspells and disruption
Being able to pay one cost less for all characters if you just have a Simba, for example, present is an ability that will make players look at this card twice
As for the best of the new creatures, O'aka, Traveling Merchant turns your excess counters into carddraw, and Maester Seymour grows creatures of your choice as you grow him
That's the difference between knowing you have 9 ramp sources (one short of the baseline) and knowing that three of those sources are conditional on your commander being in play, making your reliable ramp count closer to 6