If you go on smealum's website and read his article about ssspwn you will see why it hasn't been released. If you don't feel like going onto his website, here's the relevant information.
"To release or not to release
Generally speaking, the thing that’s been stopping me (and others) from releasing working exploits has been the fact that they might be used for piracy. Fortunately, that should not be a factor in this case, as by its very nature, ssspwn can not by itself allow piracy. That’s right, it’s the sweet spot that gives us just enough to get awesome homebrew code running in arm11 user mode, but not enough to break the system bad enough to let anyone do whatever the hell they want. As such, I personally have no qualms with releasing the exploit into the wild.
You might be wondering why there isn’t a download link available yet. The reason for that is that, as I mentioned, ssspwn has yet to be fixed. In my opinion, it would be dumb to burn such a nice vuln on just 6.3 when we know full well that we should be able to use this on 7.x, and possibly even 8.x+ with some work."
source: http://smealum.net/
"To release or not to release
Generally speaking, the thing that’s been stopping me (and others) from releasing working exploits has been the fact that they might be used for piracy. Fortunately, that should not be a factor in this case, as by its very nature, ssspwn can not by itself allow piracy. That’s right, it’s the sweet spot that gives us just enough to get awesome homebrew code running in arm11 user mode, but not enough to break the system bad enough to let anyone do whatever the hell they want. As such, I personally have no qualms with releasing the exploit into the wild.
You might be wondering why there isn’t a download link available yet. The reason for that is that, as I mentioned, ssspwn has yet to be fixed. In my opinion, it would be dumb to burn such a nice vuln on just 6.3 when we know full well that we should be able to use this on 7.x, and possibly even 8.x+ with some work."
source: http://smealum.net/