You get a buff! YOU get a buff! YOU GET A BUFF!!!

Elite Barbarians: Hitpoints +19%, Damage +14%, Hit Speed to 1.4sec (from 1.5sec)
Tornado: Radius +10%, stronger pulling power
Inferno Dragon: Hitpoints +5%, re-targets 0.4sec quicker
Balloon: Death Damage +105%, Death Damage explosion radius +50%
Wizard: Hit Speed to 1.4sec (from 1.6sec), initial attack comes 0.2sec slower
Giant Skeleton: Damage +8%
Lumberjack: Hitpoints +6%
Bomber: Damage +4%
Mortar: Boulder explosion radius +11%
Mirror: Level 8 Mirror will create max level +1 cards again

Supercell tries to explain each of these adjustments on their blog at ClashRoyale.com and Reddit will rip it up on /r/clashroyale.

Here’s what the YouTubers have to say:
Orange Juice Gaming
The Rum Ham