I saw the "...See what's coming to SONAR in spring 2016..." announcement.  One of the "In development" items is Melodyne 4 Essential.  I popped out to the Melodyne website and discovered that I can update my Editor edition of Melodyne to Melodyne 4 Editor now.  So, the question is, will Melodyne Editor 4 work with SONAR PLAT now or should I wait until Cake releases an update specific to Melodyne 4?   

I personally see no reason that M4E would NOT work now. It's ARA aware.
 
I've been wrong before but over in the software fprum some have a;ready got M4 so you might ask them.
 
(I have to wait until Wednesday next to order mine ).

I have already upgraded to Editor v4 today so will have a test at weekend and let you know.

I would also like to upgrade now if I don't run into trouble later when Melodyne 4 will be added to Sonar.

I had Melodyne Editor for 2-3 years before Sonar added it. No problem at all in the marrying of the products for me.

Curious as to whether there will be Cakewalk specific upgrade discounts as before.

Seems to be working okay in Sonar Platinum, the only issue which is nothing to do with Sonar as it occurs in standalone version as well is that although it is indicating that the input is melodic I have had to force a redetection of the algorithm a 2nd time in order for the track to appear in melodic format. Maybe some setting I haven't set properly but in any case appears to be compatible with Sonar.

I've just upgraded from Editor 2 to the latest Studio 4 and had a brief check of the current SPlat (Lexington) ARA integration and the new v4 Studio shows up (replaced V2 Editor) and is working as expected. The update process was rather seamless, as I just ran the Melodyne installer and a few seconds later it was done.
 
Cheers,
 
Billy Buck

Billy Buck
I've just upgraded from Editor 2 to the latest Studio 4 and had a brief check of the current SPlat (Lexington) ARA integration and the new v4 Studio shows up (replaced V2 Editor) and is working as expected. The update process was rather seamless, as I just ran the Melodyne installer and a few seconds later it was done.
 
Cheers,
 
Billy Buck

Are there any changes in the licensing or authorization process?
 
Thanks.

Billy Buck
I've just upgraded from Editor 2 to the latest Studio 4...

I've just done the same thing, and it went very smpoothly and works fine. Licensing (I'm using ilok) is exactly the same.
 
I just went to Studio because the difference between upgrading to Editor 4 or Studio 4 (especially from audiodeluxe) was pretty small. I'm pretty sure Studio is going to be overkill for me though. I've actually emailed Celemony to ask if there is a possible path to "downgrade" back to Editor in a later version ;-)