Will these national ratings be converted automatically for those holding them, including the instructor ones in the forthcoming EASA licences?
Each country is compiling a conversion report to ensure 'grandfather' priviliges where possible. Conversion tables are also in Annex II to EASA Aircrew Regulation (not the Annex II for non-EASA aircraft!).
Taking for example Aerobatics, FCL 905 states that the applicant holding the rating shall demonstrate his ability to a "Qualified" Instructor under FCL.905 FI (i)
This is a FIC Instructor (in UK terminology) - a Flight Instructor with privileges to instruct the Flight Instructor Course. In order to conduct the check as stipulated, they must hold the rating and also the privilege to instruct for that rating.
ifitaint...