The NPPL will continue to exist beyond April 2018, so for those depending on a NPPL: don't worry. The NPPL and it's privileges are embedded within Schedule 7 of the Air Navigation Order, CAP 393. EASA limit the privileges of national licences to non-EASA aircraft after 07th April 2018.
A NPPL Medical Declaration, EASA LAPL medical, EASA Class Two, or Class One medical can be used to validate a NPPL.
I could explain what the 'expected' in the Information Notice was all about but there is no point now since there will be no change between now and April.
ifitaint...