I do not think it was made to increase hashrate but to lower power consumption as stryfe has mentioned about his experience with using it on his machines and from what other people have said.
There is another article about it that might explain it bit more to what Bitmains intentions were with this release in firmware
https://www.coindesk.com/bitmains-latest-bitcoin-miner-update-activates-controversial-asicboost/
Any Idea how much hashrate increase after this new firmware.