The change to Leeroy certainly seems like it'll put him more into line with Rocketeer, Argent Commander, and Arcane Golem.
The Buzzard nerf looks to completely change the way Hunter plays, though. Used to be they could draw a whole bunch of cards with 5-7 mana, and Hunter decks tended to be really fast and made use of a lot of digging cards to get the combo. Now they need 8 mana to draw with UTH, so they're going to need to play slower if they want to have cards in the turns before that. A lot of low-cost mana-efficient cards just got a lot less appealing.
The Buzzard nerf looks to completely change the way Hunter plays, though. Used to be they could draw a whole bunch of cards with 5-7 mana, and Hunter decks tended to be really fast and made use of a lot of digging cards to get the combo. Now they need 8 mana to draw with UTH, so they're going to need to play slower if they want to have cards in the turns before that. A lot of low-cost mana-efficient cards just got a lot less appealing.