A tentative date for the Metropolis update Byzantium has been revealed by the developers team. Thus, Ethereum core developers Hudson Jameson, Péter Szilágyi, Ethereum founder Vitalik Buterin, and others revealed that Byzantium upgrades will be implemented around October 17th. The hard fork for Byzantium is scheduled to launch on block 4,370,000.
Now, the Ethereum's client has upgraded its code to enforce the upcoming Byzantium upgrade.
With the Geth (the code from Go Ethereum) release, the network moves closer to implementing the first of two parts in the wider Metropolis upgrade. The addition of the code to Geth is notable because it greatly increases the likelihood that the upgrade will happen at that time.
According to the code release, anyone running an Ethereum node with Geth is requested to update their software to "ensure a smooth transition". On top of that, Ethereum developer Peter Szilágyi advises node operators to update their software at least a week prior to the mainnet launch. Other clients, such as Mist, will issue updates in the coming dates, Szilágyi predictes.
Please give yourselves ample time to switch to the 1.7.x series (1.7.1 specifically for Byzantium) before the hard fork to avoid any surprises as the series does contain non-trivial database optimizations ([it] also gives us time to fix anything if something doesn't work as it should).
The upcoming hardfork is to feature a variety of improvements including increased speed and ramified security.
Ethereum price chart on coinmarketcap.com
Meanwhile, at the time of writing, Ethereum price is about $292.64, its market capitalization is $27,787,599,110.