I’m going to go further than @BenRomberg and cordially request you to either immediately make these resources available for Atlassian Connect, or make a public statement that Connect is a deprecated platform.
It is completely, utterly, wholesomely unacceptable that Atlassian does not have the guts to own their decisions and threat their BILLION DOLLAR revenue generating Marketplace Partner community with blatant disrespect by simply letting the currently dominant platform for creating Cloud apps fade away in favour of a platform that has been prematurely announced GA for political reasons but is still years away from actually being able to cater complex apps.
Atlassian, do better!