It seems like Kia is working on a successor for the Forte, because a member of the community has posted something that looks like an official sketch which points to an upcoming C-segment sedan.
The person who posted this sketch mentioned that this new model will debut in 2012 as a replacement for the current Forte which has been sold in the US since 2009, so unless the Korean automaker decides to go with another name, this could only be the 2013 Kia Forte.
This is still only speculative thinking, so we will have to wait for the official details to be released, but overall we like that we see, and the car does look like an evolution of the current model in terms of design. 

Source: Kia World