There is a speculation calendar that shows when the future 5 Day Goals will likely be released in the Speculation thread here (though this was created a while ago so there's no way to be sure if the virus closings in the US will alter or affect the dates):
https://forums.storm8.com/showthread...=1#post1604408
These goals have used many appliances that were previously released through goals, though there's no way to know which specific appliance will be used ahead of time. You can also look back through the forum to see the threads for the previous 5 Day Goals (the thread title includes if the goal is 5 or 15 days) to see which appliances have been relisted this way.
If you want to request specific things in the game, there is a forum for that here:
https://forums.storm8.com/forumdispl...s-amp-Feedback