The Deck Builder's Toolkit is back, and it's being refreshed!
In broad strokes, it's still the same basic Deck Builder's Toolkit:
# 125 semi-randomized cards suitable for building several different Magic decks
# Four 15-card booster packs from a variety of recent Magic: The Gathering sets
# 100 basic land cards to help you cast your spells
# Deck builder’s guide with tips about building the best Magic decks
# Magic "learn to play" guide
# Full-art reusable card storage box
The "refresh" part is that the assortment of cards and boosters is being kept current. With the latest Deck Builder's Toolkit, you'll be working with the latest cards, all the way up to Mirrodin Besieged!