In a recent interview with AP, Sigma's CEO confirmed that they will continue to produce DSLR and compact system cameras for photo enthusiasts in the future:
We will support both the DSLR and CSC systems. The only condition is we will focus on photo enthusiasts - people who love photography and who take pictures seriously.
During the 2013 Photokina show Sigma confirmed in an interview that for now they have no plans for a mirrorless interchangeable lens camera.
For all Sigma related news, check the Sigma category.