Given Apple's removal of numeric keypads from the laptops, and the fact that they do quite a good job fitting useful functions onto laptop keyboards etc, I suspect that they're not that likely to diversify their keyboard range. If anything the opposite.
I'm probably weird, but what I want is a narrow wired keyboard, i.e. wired without the numeric keypad. For word (not number) typing it allows more ergonomic placement of the keyboard centre screen without the mouse being miles off to the right (right handed, of course). I don't expect to see it, but I'd like to.
Even more than that, I wish I could buy something exactly like the laptop assembly of keyboard and mouse, but as an external peripheral, but like I say, I'm weird 🙂 These exist for IBM stuff, for example, you can buy a thinkpad-style external keyboard and trackpoint/trackpad. But it's specifically apple I want.