Existing plants have been tweaked with new abilities or secondary fire modes.
The ice-themed world has been notoriously punishing. In v1.62, the family gets a significant buff. They now chill zombies 20% faster, making the "Perma-Freeze" strategy viable again. However, the Frost Baron Zombie (the flying ice mage) now has 15% more health, meaning you can't just spam Blovers to win. PVZ Expansion v1.62 MOD