I poked around a bit this evening. Everything I've read gives the impression that Cakewalk by BandLab is really just the final version of Sonar Platinum re-released under it's new owner's brandname, and with some bundled extras that involved third party licenses removed... and an integration with Bandlab added in. Even if the product looks and feels nothing like Sonar a year from now, the fact that the first Bandlab release was essentially the Sonar Platinum codebase back from the dead would be enough to qualify the Bandlab version as part of the same branch/continuity/timeline, IMHO. Smush 'em all into one, I say.
Anyone who actually owns Sonar is welcome to chime in and counter. I've never been a Cakewalk license holder.