From FAQ > own special operating system Codex / We might however release an unsupported SDK for best developers
That's disappointing. I assume "best developers" means corporates. I'd have hoped for a fully open SDK as you're not able to use anything from Android etc. There's probably no end of utilities solo coders would piece together. I'd probably be looking at whether I could make a few apps myself.
I'm a little disappointed at no lighting, it's made a big difference to my eReader. No doubt LEDs would add much to cost.