I understand that the CAA, and AOPA are currently working on a complete review of the content / format of the UK version of the EASA PPL TK Exams to make them more relevant and reduce the number of exams to fit in with the 'six sittings' EASA format.
The present system is in such a shambles that this is no small task, and will require a totally new, more pragmatic approach, so don't expect the results anytime soon.
I would be very surprised if we see the fruits of their efforts before the end of this year, so anyone wondering if they should wait for the revised system before doing the Exams, should bite the bullet, and get on with the present ones now.
MJ