Update: High Moon Studios responds with more information on the PC developer.
Despite some doubts and trepidation, Transformers: Fall of Cybertron will come to PC after all. High Moon had previously expressed doubts that it had the skills needed to handle a PC port. "I know that it's not a huge leap to do a PC SKU, but it is different," said game director Matt Tieger. "It's outside of our area of expertise, to be honest."
The PC version is being ported by Mercenary Technology, not Mercenary Games as announced by Activision's press release. According to their official website:
Mercenary Technology is a professional video game development and consulting studio founded in 2010 by industry veterans. Our mission is to create well crafted, polished and innovative games. Having worked for many companies and on many games, our founders decided we needed to be independent to achieve our goals. Mercenary Technology is the result.
Their portfolio includes The Sly Collection, as well as a variety of Spider-Man and Lord of the Rings games. Transformers: Fall of Cybertron is slated to launch on August 28 on all platforms.