Even later to the party. But Godox has released theTT350-O. M/TTL/MULTI modes, HSS, 2nd-curtain. 270º swivel/90º tilt. Auto/Manual Zoom (24-105; diffuser panel 14). S1/S2 optical slave modes. Transceiver for the Godox X/Flashpoint R2 RF system. Comes with a case, stand, and tupperware cap. Early reports are that it will fire, power control, and do HSS with Godox's lights; but remote TTL will require a firmware update on the light. Surprisingly powerful for a 2xAA battery-powered flash. And the size/weight are perfect for a mirrorless body. It's tiny.
I bought the Adorama Flashpoint R2 Mini version of the TT350-O for my GX-7 and it works great. My only complaints as a Canon/Yongnuo owner are that it uses a screwlock rather than a lever, it only has 270º swivel, there's no recycle beep, and no sync port. And the way the flash communicates with the camera menu's a little weird, but it's identical to how it behaves with my Olympus FL-50, so can't really complain. Whatever I set on the flash works, and the TTL seems very accurate, both direct and bounced.
Adorama's priced it (currently) at US$85, which makes it cheaper than the i40/i60A. It is, however, less powerful. But it also folds flat, like a traditional speedlight.