Marvel's Rocket Raccoon & Groot Animation Test
Passion Pictures have created this animated short featuring Rocket Raccoon & Groot.
Avengers: Age of Ultron - Previs
Chris Olsen has posted a reel of his previs work for Avengers: Age of Ultron.
Ant-Man - VFX Profile
fxguide have posted a lengthy article on the VFX from Marvel's latest film, Ant-Man.