Luca recently tweeted the tweet below stating the untethered Jailbreak for Yaklu102 to be fake. Just as we figured the latest buzz on would end up being. However, it seems the jailbreak community is desperate for a jailbreak for the iPhone 7|7+, they will believe almost anything related to new jailbreak updates.
Comex has already released an alpha beta version of the new Cydia Substrate on his Github page and stated his motivations behind the project. Comex states his goal for making this new Substrate is to have a much low level software as open as possible and currently the Cydia Substrate we use is not. Here is some of the statements as taken from Github.