Going out on a limb: Apple Magic Keyboard = Apple Keyboard with Magic Trackpad permanently attached with one of two additional flairs like 3D Touch as a possibility.
Interesting guess.
A new keyboard without the battery hump means a new trackpad as well—otherwise they won't line up side by side.
So, even if that new trackpad remains external, I hope it gets Force Touch! I'd be surprised if not.
I HATE the diving-board style click. RSI, here I come! Clicking anywhere with my index finger feels more mouselike--and safer. I wish I had one of those new Force Touch trackpads.