msorrels
The last version of Melodyne didn't break older SONARs (or other DAWs with ARA support), it's not a given this new version will break the last SONAR. They actually went a long way at making sure they didn't break things last time. Given this is all just just at the announce stage, it would be unfair to start jumping to conclusions. Let them announce the actual upgrade to Melodyne first.
All version of Melidyne up to now was based on ARA1 specification. So till some degree they all was compatible with any ARA1 host side implementation.
So the questions are (1) is ARA2 an extension of ARA1 (2) if ARA2 is not an extension of ARA1, will next Melodyne support both?
What is clear is that hosts supporting ARA2 only will be unable to work with ARA1 (ARA1 was a bit overcomplicated and not extremely transparent, the reason some hosts, f.e. Reaper, have decided to not work with it).
Someone has to look into ARA2 specs to answer on (1)... I have to find time for that