All The Upcoming Characters listed in the game file (android)
The file is in:
Android / data / com.rovio.angrybirdstransformers / Files / data / xml.pak
This file "xml.pak" is a pak file, rename the file to "xml.txt" and open it with any file manager.
At first there sre some junk that are very confusing. Keep scrolling until a list will come, it's hard to read it so i made a edited version: http://m.uploadedit.com/ba3n/1449921210530.txt
(in the first part, "........_actor.xml" are characters, for example:"grimlock_actor.xml"
As you can see, Ratchet, shockwave and other upcoming characters are listed in here.
Also, in:
Android / data / com.rovio.angrybirdstransformers / Files / data / Audio / music_additional.pak
Rename "music_additional.pak" to "music_additional.mp3" and play it.
A music will be played unlike the other "pak" files (if they will be changed to "mp3")