I was thinking the same thing. I'm expecting a "complete all trials for every character to unlock" type of bs lol.
It'll be much simpler. Every thing you do in the game will earn you fight money (online, offline, story (ha), trials, you name it) and each dlc character, stage, costume, whatever will have a price tag. The problem is, your earn will be like 10fm per in game accomplishment and like 10,000,000fm per character. At the same time, fm will be sold in bucketfulls for 1 dollar, 10 dollar, 20 dollar, and up.
When people start to mentally do the time math, they'll start reaching for their credit cards. It all depends on what Capcom thinks 10 bucks is worth in terms of player time.