Can anyone tell if if there is any interesting Okcash protocol developments in the pipeline?
I dont actualy know that, but if you look at github
https://github.com/okcashpro the devs are activ

Edit: if you look at github you see that they are working on an electrum client, hopefully for android too.
There's an Android Core wallet up coming. No release date yet as the devs are busy with other things right now, but it's being worked on in parallel