A forthcoming bitcoin software update will be the first to feature code that could be later activated and included as part of an effort to scale transaction capacity on the bitcoin blockchain.
Called the "most significant code change" in version 0.13.0, the new code added for Segregated Witness will not activate the change, but rather be the next step in preparing it to be eventually deployed, potentially in version 0.13.1.
The software update is expected to be released in the coming weeks.
http://www.coindesk.com/bitcoin-software-version-0-13-0-segwit-code/
