Per Concernedape 14 May via Twitter, he is still working on another PC patch (1.6.9), mainly addressing bug fixes.
Given how much easier it is to implement that PC patch and port that stable version everywhere once (compared to porting the current version everywhere and then pushing updates to every port separately), it seems plausible that we'll see version 1.6.9 released for PC without warning and then provided that doesn't introduce new bugs, we'll receive an announcement for regarding port release dates shortly thereafter.
And given that CA has announced (22 July via Twitter) that he's personally working on the mobile port, it sounds like work on all the ports is being done in parallel and I might speculate that by the time the 1.6.9 PC update is ready, the ports will all be 95% complete and will be released shortly thereafter