BB - care to expand, pls?
The NPPL will not be valid in EASA aeroplanes, although I gather that there are attempts being made to establish credits for the NPPL against the EASA LAPL. The NPPL itself will remain valid only in Annex II aeroplanes, which will remain under the control of the national authorities.
Whilst it is difficult to believe that there will not be some form of credit for experienced aerobatic pilots towards the aerobatics rating, there are no procedures included in the EASA 'Opinion' and time is running short to get them included. The fact is that grandfathering is not particularly high on the agenda as most EU member states already issue an aerobatic rating and, therefore, don't need grandfather rights. It will be easier to arrange credit for ex-military pilots for the aerobatic rating as these arrangements are left to the national authorities to determine.
There have been, and continue to be many assumptions made regarding the willingness of EASA to bend to the wishes of the various representative bodies. However, experience with previous competencies that have been transferred to the Agency (e.g. Part 145, Part 147, etc.) indicate that it would be wise believe nothing until it appears print. EASA bureaucrats are both inept and devious and are not to be trusted.