I wonder if they will make a bluetooth version.
Either way, this looks very cool, and innovative. However, it has to prove to me that the arc design is comfortable and ergonomic, or they will not get many buyers. It would take a lot to pry some people away from their trackballs from their cold, dead hands...
Also, battery life, battery life, and more battery life... If it is too low, forget about it.
Other issues with mice come from tracking. Do I trust a trackpad not from Synaptics? I have tried some imitators, and have been quite disappointed. The laser on Microsoft mice seem to leave a little to be desired, even from their laser mice, compared with Logitech, despite M$ being the initial company to market with optical mice.