http://www.smogon.com/forums/threads/unofficial-uus-read-post-13.3496622/

UU Banlist: Aegislash, Alakazam, Azumarill, Blissey, Breloom, Charizard, Clefable, Cloyster, Conkeldurr, Donphan, Dragonite, Espeon, Excadrill, Ferrothorn, Forretress, Galvantula, Garchomp, Genesect, Gengar, Gliscor, Goodra, Greninja, Gyarados, Heatran, Infernape, Jirachi, Kangaskhan, Klefki, Landorus, Landorus-Therian, Latios, Lucario, Mamoswine, Mandibuzz, Mawile, Pinsir, Rotom-Wash, Sableye, Salamence, Scizor, Skarmory, Smeargle, Starmie, Sylveon, Talonflame, Tentacruel, Terrakion, Thundurus, Togekiss, Trevenant, Tyranitar, Venusaur, Volcarona

>4. UU Beta will be updated every month as opposed to every three months.

Basically, everything below Terrakion will be allowed in this beta UU tier.