It's a long story, but from what I remember, they had sort of planned on releasing it, but then at some point decided not to after drama and whining from some people, then it turned into show-off videos, and then nothing after that.
I'm just glad Wulfy shared some of the details in that other thread. SALT may not release a lot, but they do release details on some things, which is always appreciated.
To be fair, they kinda earned/deserved the flack they got during the KARL project. They were acting very high and mighty about how they would not do anything to allow/enable piracy and would in fact actively try to prevent the use of their code for piracy. Yet it certainly appears as if that little qualm went out the window they second they stopped acting as if they planned to release something publicly.
In all honestly I fully believe they never had any intention of releasing any code, solely because of how vocal they were about being "anti-piracy". You can't exactly release source code and not have someone edit it to remove the signature checks.
edit:
Don't get me wrong, I am extremely grateful to those members of the team like
@WulfyStylez who actually DO offer advice and assistance to the greater community in regards to solving certain issues that arise in cfw. But the team has a whole are jerks and show offs who are indicative of why certain dev/hacking scenes lately have been stagnant. If you have something that is an improvement in ANY way over the mean standard for the community, you should release it. At the very least help guide the community towards accomplishing it rather than lording it over them that you did something they can't figure out.
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Before this devolves into an argument about "entitlement" and how devs have no obligation to release anything (like the Wii U threads lately), let me just state for the record that I by no means feel entitled to anything anyone else discovers or develops. Devs and teams like Gateway, Reisyukaku, Roxas, Pasta, Smealum and the like are the ONLY reason we have any sort of scene and they did a lot of hard work to get us here. I am extremely grateful for that.
That said, it is impossible for a scene to exist or expand when people or teams who find things like arm9 exploits/entrypoints keep them hidden away for their own personal use. It is one thing when they simply hold onto an exploit because it is the ONLY exploit and they dont want to risk a patch yet (like Marionumber1 did for the Wii U and like yls8 does for his webkit exploits). There is a distinct difference between what they have done and what teams like SALT are doing. An argument could easily be made that SALT is negatively impacting the 3ds scene by keeping their exploit private.