Notion is supposed to have an announcement "soon" about a release date for Notion 4. Like so many such situations, "soon" has become a very elastic term that stretches to accomodate pretty an entire calendar year.
But I own version 3, and hope to see 4 incorporate better VST and MIDI functionality. I too prefer score view, and if Notion does a good enough job of it I might find myself with fewer ties to Sonar. If Sonar is going to ignore notation, then notation users will have to ignore Sonar. I accept the fact that many Sonar users couldn't care less about notation. So be it.