Lets start with the simplest form of this: CyanogenMod does not pre-announce support or lack of support for devices. Ever. Even for the Nexus 4, we did not announce support until a nightly build was available. Further, any announcement regarding the dropping of device support will be communicated via this Google+ page, Twitter, Facebook, our blog, or a combination of those; it will not be something buried in a forum post.
This morning, a comment from a CM collaborator on XDA was taken to be as an absolute in regards to support of the S4. He offered the opinion of four TeamHacksung maintainers, their frustrations and lack of interest in supporting the S4. Whats seemingly lost on those reading this is that his comments as an individual do not speak for CyanogenMod as an organization.
As for the teams stance on the S4, there isnt one at this time, and most definitely wont be one before the device is sold at retail.
-The CyanogenMod Team