I understand that the weight increase and its additional restrictions will be mandatory, i.e. if you currently have an RV4 in RAAus (MTOW reduced to 600 but certified to 680) then if the weight increase is approved then the RV4 will automatically get the increase but will then have to be maintained by a LAME (if the owner is not the original builder). In other words you do not have the option to keep it at 600kg and owner/operator maintained. I'm not sure what other restrictions will be applied but this could affect a lot of people.