I'm not sure I'd read too much into that. How else would he respond?: "Yes, thank you very much Ryan! FYI I am only part of the rotation of Saturday night anchors."
Other things mentioned in that press release on FTVLive.com:
*Stephanie Abrams was named co-anchor of AMHQ. This actually happened on November 8 (and was announced earlier).
*Nic Roberston named CNN International Diplomatic Editor. A simple google search will show you this happened back in September 2015.
*Kala Rama named WPIX weekend anchor. This actually happened back in December.
There are a bunch more, and some of them happened earlier this month while others happened last fall. I think they were just stating what was announced back in November, that he is part of the rotation, hence the "a" instead of a "the" in the press release.
Also, when Kate was announced as the Sunday anchor, many more outlets reported this, not just FTVLive.