I have been working on putting together an end-to-end replacement for the userland parts of the exploit tooling--with help from a well-known jailbreak developer (who did tell me he would like to come public with this, so I will be crediting him in the final release and you will all find out who it is... "SURPRISE REVEAL" ;P)--that, when combined with my crazy new Substrate "let's hook dyld itself" implementation, simply fixes all of the reasons why this "jailbreakd" that coolstar and Morpheus want so badly supposedly needs to exist.
Saurik notes that the architecture without a jailbreak daemon is much cleaner and will be more stable, "it means that there isn't some weird coordination boundary halfway between Substrate and the jailbreak".
Although work on Substrate is 'almost done', saurik says he still has some work to do to get the full Cydia Installer stack ported. He also expressed concern that we are are reaching an era of jailbreaking where we get a cygwin-like Unix simulation rather than real and high-quality tooling "which had been the core thing that motivated me to jailbreak my own devices."
There a lot more detail in saurik's full reddit post linked below. Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.