He said he would consider "a clean, well written, and well tested" pull request that would add WebSocket support to the Android version of Signal". That would

He said he would consider "a clean, well written, and well tested" pull request that would add WebSocket support to the Android version of Signal". That would replace GCM. Don't confuse the issue with LibreSignal. Problem is Moxie is worried about the security of random 3rd parties publishing signal clients. Doubly so if published by f-droid (which doesn't' sign package with the developers key). Additionally he wasn't want these 3rd party client that may or may not be secure using the whisper systems infrastructure. So it seems that signal could get a GCM replacement, if someone writes one.