This is major. Some of the new abilities are going to make crappy pokemon good.
http://www.serebii.net/blackwhite/dreamworldabilities.shtml
The biggest ones:
Blaziken gets Speed Boost
Politoad gets Drizzle
Ninetales gets Drought
Vapoareon gets Hydration
Swampert gets Damp
http://www.serebii.net/blackwhite/dreamworldabilities.shtml
The biggest ones:
Blaziken gets Speed Boost
Politoad gets Drizzle
Ninetales gets Drought
Vapoareon gets Hydration
Swampert gets Damp