Each Commander Deck set includes 4 ready-to-play deck of 100 Magic cards (2 Traditional Foil Legendary Creature cards, 98 nonfoil cards), a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil special treatment card of rarity Rare or higher and 1 Traditional Foil special treatment Common or Uncommon card), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 Helper card, 1 deck box (can hold 100 sleeved cards), 1 strategy insert, and 1 reference card
Cryptic: The telltale sign of a Tyranid invasion, is the Shadow in the Warp
Gavin Verhey specifically stated multiple times in this announcement that a lot of the terms of these tiers fall under feel. It is technically very possible to build an incredibly powerful Commander deck that falls under the deck construction rules of the Exhibition Tier, but these decks are specifically weaker than the average Commander precon according to the second tier
The crafted side is icing on the cake, and against certain decks that are light on removal or in grindy matchups, crafting a card should give you the edge
The first iteration we tried sacrificed creatures to activate the ability but that felt blue-black and not at all white
Planeswalkers are a good start, among other options