Here's some info I got for the GAN mini M Pro, that should be available very soon. It is nice, small and super light at 53mm and 55g. The core is the same as what's in the 11 M Duo and it performs similar, but apparently more stable and faster due to its smaller size. The spring adjustment system is new, and similar to Moyu's (2 dials). Magnet strength is adjustable. It is like a mini 11 M Pro, and the most featured small cube. There are core magnets as well and replacement rods.
What is unique is that it has different widths in its pieces?! The corner pieces are slightly less in width than the centre and edge pieces. The result is like a larger cube with all the 6 faces sanded down. The edge pieces actually look uneven (width vs depth). Here is a photo of it compared to a regular 56mm Gan cube.
Apparently, with the middle layers slightly wider, that has the advantage of avoiding bigger fingers (not children's) getting caught or jammed in the gap when doing M moves on this small cube, but is it legal? Gan seems to take more liberty with its shapes, e.g. the round centre piece .
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See also more description here on this Australian shop:
Looking for a premium flagship 3x3 but the standard 56mm cubes are too big for you? Look no further than the GAN 11 M Pro Mini! Although 3mm smaller sounds like a minor adjustment, the difference in feeling is very noticeable which makes the GAN 11M Pro Mini the perfect choice for one handed...
www.dailypuzzles.com.au