Oh I see. Hmm I mean it’s topic adjacent no?
Your post addresses previous questions, as well as relevant info to potential buyers of the Launchkey (ie would launchpad better fit my needs, should I hold off for an SL mk4, etc)
Anyway, your post reminded me that novation does tend to do post-release support, so I’m not sure if a launchkey mk4 necessarily means that novation will release an SL mk4.
Aside from poly Aftertouch, they could probably just continue to add features (if needed) to the SL mk3’s because it’s a solid device (resale stays pretty high on those, so they probably sell fine still)