There isn't any reason why the radial menu wouldn't work on both platforms, though?
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You can use a radial menu with a mouse pretty easily, and if you prefere using the keyboard, you can still map the ability slots to keys.
A good gamepad UI can be used with mouse/kb as well.
A radial menu system for gamepad and mouse does indeed sound like a great idea. It would make actions more compact yet highly accessible.
Perhaps such a method could be considered for other ingame menus as well.
It would certainly be unique in MMOland.
I get tiggles just thinking about seeing in-game.