This has been the 'holy grail' for permit aircraft for quite a while. I have to say I am largely unconvinced.
The majority of aircraft are 'sport' orientated. but that does mean they do not have the solid (many would say stodgy) handling of the certified aircraft. control forces are generally much lighter and whilst they have natural stability they are generally much livilier than the equivalent certified machine.
This does not mention they cannot be flown in IFR, but they will be more work and much harder to do it over any length of time. Fine for breaking through cloud cover but anything more - I'm sceptical.
But let's wait and see.