It changed... A LOT.
-Increased Recharge Delay
-Significantly increased Recharge Rate
-Reduced Amplify damage
I dont really care about the recharge delay or rate (in this case)... but they changed how amp dmg works.
Now the amp dmg is divided among all projectiles fired from a single shot.
So, you dont add +30k (f.e: 30k amp dmg) to each pellet, those 30k are divided into each pellet.
You can REALLY notice the difference.
BTW i dont really mind, never used The Bee, dont have it, and just yesterday finished PT1 (have the game since release) lol xD