Fable Legends is going to be free to play whenever it finally launches, so it is not surprising that we can expect micro-transactions helping sustain the game.
Those micro-transactions have now leaked out, showing the money to credit ratio in the game. On the low end $4.99 will net you 850 gold while on the high end $59.99 will get you 12800. There is also a bunch in between which you can see in this photo as pointed out by Reddit:
Of course, we don't really have any context for this, as we don't know how expensive characters will be or what 12800 coins will get you. For that, we will have to wait for the game to turn up…whenever that is going to be.