I haven't worked on the modules yet so I don't know if we can override Arduino's digitalWrite(). At least, we'll have a gb.digitalWrite() function.
The first module I'm planning to do is a general purpose module, including amongst other things a I/O extender with one of it's outputs used to drive a SPI nRF24L01
(Disclaimer: That's not an official announcement, only what I hope to be able to do)