In 2018
ETH futures. Futures trading is coming before June 2018, as announced by Bloomberg a few days ago.
Upgrade of the network, with an intermediary version before Casper, based on hybrid security : traditional miners will still be able to mine, and stakers will also be allowed, as described above. Later, Casper will be fully deployed, only staking will be possible.
More than 200 companies (such as Intel, Microsoft, JP Morgan, ING, Bank of America, UBS, Mastercard, ...) are part of the Enterprise Ethereum Alliance. They started to develop almost one year ago and the first outcomes might be released.
1: It allows for creating a decentralised system (contract) which receives your ETH budget, then convert your payments to tokens, transfers them through microRaiden, and your recipient withdraws the corresponding ETHs when the channel is closed.