According to the Manager Ethereum Foundation Hudson jameson, the activation of a new hard forks in the test network was moved to the beginning of October.
Developers define the block number on which Istanbul will be activated in a test network. According to our estimates, this will happen around October 2, depending on how fast you will create blocks.
Scheduled for September 4 launch hard forks already was postponed once because the company Parity, the developer of the infrastructure of blockchain Ethereum, was not ready and stated that it would require at least another two weeks. Wei Tang, one of the developers, said:
We are faced with a large number of proposals for improving Ethereum (EIP), which should analyse and assess before you integrate them to edit your EIP.
In addition, the co-founder of Ethereum Vitalik Buterin said that the Ethereum blockchain is almost full that can inhibit the adoption of Ethereum potential participants.