From 28th october it will known as KOLL. Tt will be required for settlement (ILR) as well as naturalisation.
It will have two parts:
1. Pass a life in the UK test.
2. Have a english language qualification in speaking and listening of level B1 cefr or above.
If someone passed a life in the UK test before 28th october then they do not need to do it again. If someone submitted liuk test while applying for ILR then they only need B1 qualification.
regards