I hope that the OtherHalf connection with Jolla phone will be standard-based - like, a variation on USB topic. At the same, the physical shape of the connection between the OtherHalf and the Jolla phone will be so unique and comfortable to use, so aesthetically pleasing and reliable under any conditions, that the copycats will not be able to release any competition in time. With Jolla phones already being pre-ordered at this moment, many of the imitators will beg Jolla to share blueprints of exact shape of Jolla phone, so that they would be able to release compatible OtherHalves and phones. Jolla would be an idiot to not use this opportunity for collecting money from others by granting franchises to select few. Besides, a few high-quality polished OtherHalves being released by other companies at the same time Jolla releases their phone would make for a very loud splash in the mobile computer community.
And yes, a folded-wing solar-charger as OtherHalf could be an interesting idea. But, it should have some alternate useful function at the time when it is folded. And don't forget that a large solar panel should either have a large battery to store the charge, or be directly attached to the phone to charge it. And now I am thinking about ornithopter with large solar-battery wings. SunBat...
What about Sailboat Other Half for Sailfish-powered device? Take part in International Robotic Sailing Regatta!
Best wishes.
_________________
Per aspera ad astra...