Chap 218
Chap 219

Well this doesn't really clear up any previous questions, but at least it only added one more.

Clow's sign - I wonder if that's the same one as CCS Sakura's. If that's the case, then it just means her sign was obscured from Fei Wong's view by Syaoran(s).

Weird thing is, if that was the case though, CCS Sakura could have helped them out all along during that fight instead of waiting till the last minute. Fye showed you can work magic outside of your sphere, but I guess it's quite taxing.

The alternative is that somehow Son Syaoran developed the ability to use Clow's sign, and somehow applied it to all his allies. From memory, his pervious shows of magic didn't show a magic circle, so it's not necessarily the same as his dad's.

Anyway, it was some good flashy magic chapters.