What exchanges will support it?
All of them should support it (="credit it"). Otherwise they would be stealing BTF from you.
Another question is, how many exchanges will trade it and whether they will start trading futures before the fork date. We're working on it.
But the majority of them probably won't "credit it", and with all the other previous forks, exchanges like Kraken have not rewarded tokens to us. So which exchanges support it, and then which ones will trade it?