At your command, sorcerer.

Truth is I don't have much information, either. I've been following news reports and it seems Yuna's team is still considering which, or both to participate.
I think eventually Yuna will go to 4CC, I heard Orser will go anyway with his new Australian disciples(sorry, their names just escaped me), but I certainly can't guarantee about Yuna.
On aother note, it seems korean skating federation has set the ticket price of 4CC ridiculously high, which was gratuitous years ago when they hosted it, I don't know the exact price but it was somewhere between 800~900 US dollars if you're to watch every competitions plus exhibition. So there's been huge uproars among skating fans and some media reports followed then KSF backed out saying they will reset the price until 23th January.
My think is Yuna will make it official after 23th(actually that's what was reported 3 days ago), it seems Yuna doesn't want fans to be ripped off and hopes they will lower the price by giving the thought she might not participate, sure with Mao and Miki and other big stars tickets will be sold out, however it's just not the way to promote this sport they are in charge of.
This is off topic, but recently there's also been a controversial report that KSF is not all that happy with Yuna's achievements, simply it's a power game among short track, speed skating and figure skating, and Yuna doing well only does harm to them with the way they managed to put their bubgets so far since figure skating was almost inexistent before Yuna came along... and who knows there's been embezzlements all over the place.
So here, fans are in rage now and many talk about KSF rather than 4CC or Yuna herself. Honestly many of Yuna fans want Yuna to skip every competitions held in Korea, since they feel KSF use Yuna to bring money without supporting her. I would like to differ but anyway....
OTOH it seems many of Mao and Miki's fans are gratified to see them, preparing banners, presents and stuffs and I hope people to know that we, both Korea and Japan(hopefully?) are not consisted of malicious bashers, there's a lot of genuine heartfelt fans too.
