As a maker, I've been following Adafruit since they sold a handful of products, probably assembled and boxed on Limor's dining room table.
Adafruit has forked microcontroller libraries and toolchains before, and a huge chunk of their success has been directly due to Arduino and related things. So it will not surprise me if they are gearing up to announce their brand-spanking new Arduino-compatible devices, software, and ecosystem.
They could call it Adaduino.