I guess it's safe to say the java version is on hold right now.
I don't know the apple rules for a app to get approved especially if it's a p2p app. I also don't know if p2p streaming would be accepted by users without a unlimited data plan.
The apple developer program costs at least 99USD/year and you also need the device(s) for testing and a android device as well. Makes no sense to develop for one platform. Since this project isn't making any profit this probably will not happen anytime soon.
But you are right, supporting mobile devices could give streamer a boost. Unfortunately there is no manpower to do this. The pc client needs to reach the next stable version first and the website as well