Ok, from what I can tell, there is some pre-registration for the mobile game happening.
Depending on how many people register, we will all (or maybe only those that registered, I need to look into this) receive some DMM-style awards:
10k : 1k FGs
30k : 2k FGs
50k : 2k FGs
100k : 5* gacha ticket
150k : 6* gacha ticket
200k : the new 6* girl
The awards are cumulative with each step.