Although ETH has made a great leap since the token distribution in December, we expect ZIL to shoot up after its release. ZIL is expected to become tradeable on 25.01.2018 at EtherDelta.
No news concerning centralised exchange listings have been released from the team.
Hashgraph currently operates on a permissioned, private-based network. What this means is that the number and identity of the nodes participating is known beforehand. This is why it is unfair to compare it to a blockchain which is public and non-permissioned, meaning there are no fixed number of nodes. As of writing, there is still no public and non-permissioned version of the Hashgraph available.