manuel on 08 August 2010
Built-in MotionPlus or bigger internal memory sounds reasonable, but ouldn't warrant calling it a Wii 1.5.
It would have to be a big addition like Kinect (adding a whole new control scheme), but I doubt Nintendo would do anything like that so long into the life span of a console. (They probably learned their lesson over 20 years ago with the Famicom Disk System.)
I'm no analyst, but I'm pretty sure there won't be a major harware revision. With high probability the next release will be a completely new console.
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