The information notice say's it applies to all SUAS - SUSA up to 20Kg and that if you intend to operate within the 150M Congested area limitation you need to have passed the CAOSC process (Except for a 3 Month period of grace from now, where the CAA will still accept case by case applications) so no differences for sub 7Kg platforms that i read. It says the CAA will charge a £134 per hour to asses each CAOSC case submitted (which seems a bit of an open cheque book approach) could get very expensive if the submissions are way off the standard. Hopefully people like Resource UAS will be the "accredited bodies" referred to once the base lines are established and can smooth it out. I think i am happy that there appears to be no divide at sub 7Kg, getting below this invited compromise and having looked through the CAOSC template it does not look like compromising things like battery redundancy will fit very well.
No mention of those holding existing sub 7 Exemptions, as Carapau said, if your permissions currently say OK then i assume it is.