Great summary by justanopinion. Just to clarify pt6 though, in case someone misinterprets it:
Regular Service personnel aged under 45 on 1 Apr 12 will be automatically
enrolled into FAFPS when it starts and any further pension rights they earn from that date will be under the new scheme. Enrolment will be mandatory; there will be no ‘Offer to Transfer’.
"from that date" refers to when FAFPS starts (currently assumed as 1 Apr 15 but I guess could slip), not 1 Apr 12.