Another thing to consider in addition to all of the work Cakewalk is currently putting into the "core" Sonar, is that they are on the threshold of releasing a cross-platform version of "core" Sonar for MacOSX.
If the Mac version takes off as hoped, I would bet my last dollar that as far as add-ons and plugin features, they will make an attempt to leverage the use of cross-platform only plugins for all future development efforts. Why unnecessarily duplicate code and related expenses for plugins once the core is working as expected on both platforms.
Once they have successfully made the core host DAW cross-platform, then as a business decision, they could focus development on one set of universal plugins and addons for both platforms.
If that were to happen, it might dictate what features beyond the core gets developed first going forward, with emphasis on the dual platform. Old Windows specific stuff might need to be either left behind, end of life, but still working on PC, or redeveloped to work on both. If we need a new sampler then, we'll get a new sampler.
Obviously nobody has a crystal ball to see the feature roadmaps of the future. But it's coming...