The news about the new Signal Foundation is encouraging, provided that new stakeholders like Acton (and presumably others) don't get it in their heads to screw things up in the usual Silicon Valley way of screwing good things up. Moxie Marlinspike remains at the helm, and I trust him to keep Signal from becoming another ad-driven sinkhole of VC grossness. Also, the fact that this new entity is a non-profit ought to keep the incentives of all involved relatively pure.
It will be exciting to see if/how the Signal clients currently available will improve, given the sudden influx of resources.