How long ago did you buy it? Valve may let you return it.
Bigger screen, bigger battery, better input response time, longer battery life (battery and apu improvements), some reviews showed slightly better performance due to the new RAM (mainly fixing stuttering in some games).
Also saw one person got a steam wallet credit for the difference in price between their LCD version and the price drop for the LCD versions.
I'm dying over this. I preloaded my steam wallet, left a meeting early, and started spamming the buy button the second it released. Couldn't get the purchase to go through for 30 minutes so I'm panicking the whole time. Turns out 5 hours later it's still in stock rofl.
TIL I am a baby