The trailer video for Avacyn Restored has now been published by WoTC -

Brace yourself for loads of possible card Avacyn Restored art spoilers and several new Angel creatures.

Avacyn%u00252BRestored%2BAngel%2BCathedral.JPG
Avacyn%u00252BRestored%2BArt%2BSpoiler%2B1.jpg
Avacyn%u00252BRestored%2BArt%2BSpoiler%2B2.jpg