The Bastl DUDE seems to be generating interest, but what about the PBMIX3 portable mixer from the patchblocks guys? Due to ship in May '17 : r/synthesizers
Bastl Instruments microGranny 2.5 Granular SAMPLER - The Sound Parcel
Dice Bag (battery powered dawless music production) - YouTube
BASTL INSTRUMENTS DUDE Battery Drive Is Also Possible Mini Mixer-buy at a low prices on Joom e-commerce platform