All I'll say is I'm grateful for both long press and 3D Touch on the keyboard alone, and I don't think they can be combined there. Force is a natural maneuver that I think should be separate from long press. Force implies a sense of urgency, hence "Quick Actions." That is, both input methods should convey different intentions.
Combining them on the Home screen at least seems dumb. I think Apple is positioning 3D Touch as a frequent input method. They're expecting you to deep press on an icon as often as you can so you want to display the most frequent and urgent actions in the Quick Action menu. Adding a button to delete the app every time you deep press seems like a waste. I think the new ubiquitous Share button is dumb and redundant.
Combining them on the Home screen at least seems dumb. I think Apple is positioning 3D Touch as a frequent input method. They're expecting you to deep press on an icon as often as you can so you want to display the most frequent and urgent actions in the Quick Action menu. Adding a button to delete the app every time you deep press seems like a waste. I think the new ubiquitous Share button is dumb and redundant.