Took part in the freebie bounties for this, but haven't kept track since then. Have the devs actually done anything noteworthy since then?
Not that significant. All that is done that made it good enough is when they allow us to send the WAVES to our wallets that's it and that was months ago. After that we get to be banned from the slack channel.
As soon as the announcement of releasing the mainnet is going to be made, the price will rise.
As soon as the price rises, Poloniex will also want some of the action!
Seems to be a trend for Poloniex to add coins that have lots of volume trading going on.
They do have large volume during the start and even until today.