Serious Sam Developer Croteam Working on New IP

Croteam CEO Roman Ribaric has confirmed that the Serious Sam developer is working on a brand new IP. 

The CEO was asked by e-mail about the progress of Serious Sam 4 by fansite Seriously where he dropped this announcement. Ribaric described this mystery new IP as "a cross between Portal and The Witness".  

Ribaric also insisted that Serious Sam 4 is still in development and is expected to be released in the fourth quarter of 2014.