On June 16 the alpha code for the scaling solution Segwit2x was released to the public following a large number of mining pools having vocally supported the plan. Since then a large majority of miners who back the Segwit2x roadmap have started signaling with their hashrate.
The New York Agreement Moves Forward With the Segwit2x Alpha Release and Significant Miner Support
What Will Happen If Segwit2x Reaches Consensus?
The Possibility of a 4MB Increase and 8,000 to 10,000 Transactions Per Block