My view for bundled stuff included with X4 or X5 is this.
Dump 32 bit Sonar. It's over.
Do not supply any plugins with Sonar except 64 bit VST's and Pro Channel modules (keep backward compatibility support though for legacy plugins for people who need them). Oh and keep the MIDI plugins as well.
Distribute all available Cakewalk Pro channel modules with X4 Pro (which are currently available in the store). Include VST3 versions of the plugins as well inc Pro Channel plugins bundled in X3 like Quadcurve. This will make people who have previously bought PC modules feel a little happier.
Bundle Sonitus plugs as VST3 (yup unlikely that will happen).
Job done.