I guess many of us were waiting for this: the possibility to use Sigma's excellent…
Custom Grip For Canon EOS M
Want an aluminium made and black finished custom grip for the Canon EOS M? This grip is more pronounced than the original one and should give a better hold with bigger lenses. The grip is sold for $53.51 at Rakuten (check shipping conditions). Mount instructions are provided. Your next weekend DIY project? :-)
[via dc.watch.impress]