Iridium Next satellite constellation will be carrying a system call AIREON which is intended to track all aircraft ADS-B transmissions worldwide including the poles. INMARSAT will handle tracking data 'free' of charge, but of course you have to be carrying the INMARSAT SATCOM equipment.
Neither approach will give any assistance to finding aircraft that switch off their ACARS, transponders and ADS as in MH370, nor give any support to DFDR/CVR data recovery from aircraft that crash in deep ocean waters. As usual the attendees at ICAO are not systems analysts determining the functions that are required, they are more conference attendees trying to get an agreement so that it can be said they 'did something'.