I’d totally love it if they do. 
But the extent of the official pie menus has mostly been only to enable/disable in the add-ons menu and to change hotkeys in the input settings. There was talk about it for 2.8 a while back, but I’m not sure if the Devs are still considering it.
But honestly, we could really use a more streamlined & modern Hotkey/Pie Menu Editor for 2.8 and beyond. Trying to change the functionality of a single key’s function across everywhere it’s mapped in Blender is such a chore atm. And if you don’t know what you’re doing, you can seriously mess it up.
And the fact that maybe the Keymap is embedded into a part inside the userpref.blend or some obscure script file inside the Blender directory makes it hard to just open up in script editor and just do mass ‘Find & Replace’ with. I’m sure the Devs have easier ways of doing it, but for the common end-users? 
A more explicit method would be to use something like Wazou’s Pie Menu and edit the python code in it to add your own commands. Reason I say this is,
- It’s free.
- Doesn’t screw with the official Pie Menu file.
- Just looking through the code and tinkering you’ll quickly get the gist of how these pie menus work and you can easily start customizing.
I’d totally love something like the A+ Pie Menu Editor by Roaoao, or at least a basic/similar version of it come with Blender 2.8 by Default. Here’s Hoping. 