I would like some clarification on this.

At first I thught it was going to cut off any gil past 99,999,999 but the idea of that is so crazy I can't imagine SE doing it. 100mil isn't a lot of money in this game and there will be thousands of pissed off players when including people who have quit and are waiting for V2. The other and more likely thing is that they will divide all gil in the game by 10, which I'm fine with. Relative wealth remains the same yet prices are lower for new players at NPCs.

But if there is no clarification I will definitely take the safety option and buy some extra characters. It's not like I'll have to pay for them in V2 because as a legacy member I get something like 8 free per world anyway. This is another reason it seems unlikely that they would screw over people, it's so easy to move gil around.