Currently the government requires students resit maths and English in sixth form if they don't get a C at GCSE.
With the new GCSE a good pass is to be set at a grade 5.
However, for at least the first couple of years of the new GCSE, students will only be required to resit in sixth form if they don't achieve a grade 4, not a 5. This will be increased to a 5 at a date to be confirmed.
Presumably the government have realised that the first couple of cohorts are not ready for these new GCSEs because they were rushed through and the information about them (maths in particular) has been terrible.
Of course in later years, students who got a 4 in the first couple of cohorts will be competing against better prepared students who were more likely to get a 5. They will be disadvantaged because they didn't have to resit to get a 'good pass'. They may find that they have to resit later on anyway.
Good work DfE.