Bitcoin core developer Pieter Wuille recently completed a long-awaited upgrade to the bitcoin protocol. Segregated Witness, or 'SegWit' for short has now been published, and miners can now upgrade their software.
Having become an overnight sensation during the Hong Kong Scaling Bitcoin conference, in December of last year, SegWit redesigns the core process of the bitcoin protocol itself, making it more efficient.
http://bravenewcoin.com/news/segregated-witness-has-been-released-tackling-bitcoins-transaction-limit/