So it looks like (and I noticed too) that Kim Wu is now sporting an all-new dragon tattoo on her left arm/on the left side of her arm. Overall Kim Wu now has a new dragon tattoo on her body just like how Jago now has a new tiger tattoo on his body in the new KI reboot 
JAGO THE TIGER WARRIOR AND KIM WU THE DRAGON GUARDIAN! LET’S GO! YIN AND YANG! TIGER AND DRAGON! 
The difference is that Kim Wu’s tattoo doesn’t glow like Jago’s does.
I just checked the trailer; Kim’s tattoo on the her right arm, whilst Jago has his tattoo on his left arm
Maybe it’s not a tattoo. Maybe its her dragon disguised as a tattoo.
It does look unusually solid/opaque for a tattoo…
And why else would she remove one sleeve? So it can come and go more easily, perhaps?
Can’t wait to see more of it displayed by maybe a tank top tee or some other outfit!!!