Update - Nothing really new in the game files, most of the fun will happen when PTR servers come online. However, we do have the model of Thor Mini-Pet.
Thor Starcraft 2 Collector Companion Pet
This patch added Mini-Thor to the game files.
The Mini-Thor is a reward for players who buys the Starcraft 2 Collector's Edition release on July 27th. (See this news for more details)
PTR Patch 3.3.5 Notes
For more information, check the following post: