The Transformers movies have been phenomenally successful, with the third entry in the franchise taking in $1.1 billion at the box office. That isn’t the whole point of the franchise, however, and Hasbro president and CEO Brian Goldner indicates that as part of an effort to push more toys, the next Transformers picture would introduce a new set of robot characters.
The reasoning is that Transformers: Dark of the Moon action figures didn’t sell well because the two previous films had also featured the same characters. The hope of the toy company is that a new robot lineup will boost toy sales.
It has already been stated that the fourth Transformers film will feature an all new human cast along with a refreshed set of robots.