Bombs wise, Yula the Fair on Horde's side if you have one of the locations for counters. Zalan Ragewind is powerful too, with a very useful effect and solid 3/4 protector for 4. Sergeant Pugg is a machine, huge for a 5-cost, as Dethvir is at 4-cost. Blood Knight Haelath and Windstriker Larun deserve a mention too I thin, Larun just because of his large body on a 3-drop.
Alliance doesn't have as many imo, Zumbly Fiddlespark seems solid and Endina the Haunted could be very handy paired with some combat tricks if nothing else. Dimzer and Royal Guardian Jameson are huge, Adam Eternum would be a pain to deal with no doubt, and Iravar is an efficient board clearer if you've got one of the good locations.
Weapons: Some very nice ones this set. Hope Ender, Blackout Truncheon and Vengeful Gladiator's Cleaver, Wub's Cursed Hexblade for casters, Jinrohk as a finisher, Steelhawk Crossbow pretty good too. Heartless and Firemaul of Destruction I'm not sure about.
All 3 arena armour sets seem powerful. The Priest one is gamebreaking with its triple ally bounce but the other two both supply a powerful tap power in limited. Bonefist Gauntlets support previously mentioned weapons well.
Call to Arms: Arathi Basin I think is the most bomb quest we've seen in a while. Towers and Bunkers is very solid if you've got a location, and on that note, Alterac Valley is powerful, you'll probably pull it off once every game and some games twice. Plus its the best for fueling previously mentioned honor allies. Eye of the Storm seems great, Arathi Basin solid but not quite as gamebreaking.
Class abilities - Celestial Shard, Grizzly Defender, Dundee, Explosive Trap, Holy Strike, Blessing of Kings, Convert, Uplifting Prayer, A Taste of Divinity, Tithe, Carnage, Backlash, Hesriana.
There's my theorymonz for tonight :P
