Eh, it's probably old news by now or there's a site about it that's better. But I got bored and wasted time to figure some things out so anybody who wants to see this doesn't have to. http://www.legendarypokemon.net/bw-stats This site lists the new base stats for species in Black/White, if you scroll over to the right it also lists their abilities and any Dream World exclusive abilities.

Some are old, but many are brand new. Some are even going to be exclusive to a select few older generation pokemon. For example, Scizor, Registeel, and the Metagross line are a trio in which a new, unidentified ability is going to be exclusive for. Another example is that Dragonite and Lugia will share a new ability nobody else can get. Anyway, any abilities that weren't in the older generations are only listed as a number code here. But here are the identifiable numbers with their translation as found on Serebii here: http://serebii.net/blackwhite/ability.shtml
125 = Encourage
127 = Anxiety
128 = Competitive Spirit
129 = Weak Kneed
130 = Cursed Body
131 = Healing Heart
133 = Broken Armor
140 = Telepathy
142 = Dustproof
143 = Poison Skin
144 = Regeneration
145 = Pigeon Heart
146 = Sand Throw
147 = Miracle Skin
149 = Illusion
151 = Slip Through
152 = Mummy
153 = Earthquake Spiral
154 = Justice Heart
157 = Herbivore
158 = Mischievous Heart
159 = Sand Power
160 = Iron Barbs
163 = Turbo Blaze
164 = TeraVoltage