Will there be an asset exchange marketplace (something like Nxt AE and Counterparty) in Byteball?
There is a smart contract example in the white paper on pages 29-30 that can be used to set up a decentralized exchange. Anyone can start from there and build an exchange. I could do that myself but would rather allow somebody else to be first as I'm not willing to control all important pieces of infrastructure.
This network makes a little sense without practical applications on top of it, like decentralized exchange. You better give some bytes to companies who will build such applications.