Do away COMPLETELY with the plug-out nonsense I say. This in my mind is mainly for marketing purposes.
Use the variation mechanism on the System-8 panel to facilitate vintage Roland oscillators and filters, and keep it one unified engine. A sequel to the System-8 engine, basically. More voices, more modulation, more multi-timbrality, less plastic and no lights!
If it is sporting Jupiter, Juno etc filters and oscillators that should be enough to lean on from a marketing point of view. The plug-outs on the System-8 are the most boring part of that synth. Having the oscillators and filters should suffice to give us the essence. S8 right now only has the filters, not oscillators. Keep the FM, that adds really nice timbres.
Nickel and dime us with preset packs, not complicated plug-outs that need a convoluted light show and Roland Cloud system to beam them into the synth via a DAW - awful!
The system-8 engine right now is very underrated and is a modern classic. It sounds phenomenal, it just needs more LFOs and voices etc.