Ah, interesting.
Got two as well as I'm in my 7th year Japanese Koda Gumi already.
In fact they implemented a new system right before the tour to make it easier to spot and probably also to encourage FC members.
It's now a colour-coded system, divided after the years you're in the FC.
It's the new digital member card.
Fans under 3 years are colourless.
3-8 years are purple members.
9 and upwards are golden members.
I'm purple correspondingly.
(censored my member number)
Btw. they also uploaded a 1 minute recording from LIT from last weekend (no selfie-camera, a normal recording) yesterday.
Plus all the small videos every week from the meet & greets from all dates and her circle forming with band members and dancers before the shows.
Don't know if any of those are going to be on the international one later (as the daily tour reports sadly aren't uploaded yet there as well).