There's a thread in chat about this too.
The announcement on what they might be doing is as clear as mud, and appears to do nothing for families where one adult works part time for a low income (these were the very people who were hit by the removal of the 10% tax rate, and it looks as if they may miss out on any amelioration here too).
There has still been no sane announcement on the NI aspect. So the administrative costs of "claim and claw back" remain, as will overheads of bringing in a new system, and the ongoing maintenance of varying claims as incomes change. This will be an expensive change administratively, and it seems unlikely it will bring the scale of savings envisaged.
It also continues to drive a coach and horses through the principle of independent taxation.
It would be better all round to make savings by just freezing CB for longer (or even making a small cut) as you can make provision for the lowest income families via CTC.