Here's a statement from EA Sports on Loyalty Rewards.
As a thank you for playing the original Garden Warfare and to welcome you to Garden Warfare 2, we have some rewards for you!
We based rewards on the highest rank you achieved in Plants vs. Zombies Garden Warfare:
Rank 10 +
- Helpful Fun Pack
- A mix of 5 customization and consumable items
- Wondrous Pack of Greatness
- A mix of 7 customization and consumable items
- Guaranteed Super Rare item!
- Includes Rank 10+ rewards
- Phenomenal Character Pack
- Guaranteed Rare or Super Rare character!
- Includes Rank 10+ and Rank 25+ rewards
- Century Pack
- Includes 5 Super Rare Customization items!
- Includes Rank 10+, Rank 25+ and Rank 50+ rewards
- Legendary Unicorn Chomper
- Unlocks the Legendary Unicorn Chomper!
- Includes Rank 10+, rank 25+, Rank 50+ and Rank 100+ rewards