Just throwing some blind ideas out here...
He did say "Bet on us", which could imply a new clan or new characters. Perhaps it could imply 2nd LDs for each clan or a Leader Ld. However we must take into consideration that May 17th will be a NB character day, so the LD possibility is unlikely.
Okay even though the new comic said that we wont see the masked warrior until May 17th, but that doesn't mean the other people in his clan won't come out tomorrow, just a lesser of a chance. The reason why I am keeping that into consideration is because the coliseum Gangster Squad starts tomorrow, which includes the Montana and the Montana was the masked warrior's victims!
This Masked Warrior card could come out tomorrow, and then who he really is could come out on May 17th? Anyone else on board with still the possibility of the New Clan coming out tomorrow?
Im still going to stand by y prediction...new clan with a bonus of protection of power and damage