I guess we'll see.
Every software release coming from Zimmerman seems to make source code available under different terms, so I'm not so sure Silent Circle's release will be the same.
Considering the strength of Silent Circle over alternatives that already exist seems to be tied to the (subscription) service, it would probably be no damage to the business model at all to make the client fully open source. As such, I have hope that it will be released under a copyfree license, though not very high expectations. If it's not released under at least some kind of open source license (as opposed to just "source available" like Zfone), it also won't be ported as widely to different platforms, which would be a crying shame.
