The autocollect feature is that crate icon that appears when something needs to be collected. It costs 5 diamonds to use and it will collect all of your finished production instantaneously. If your supplies was also being collected, a sidebar will come out with the (6) different production times (before it collects them) and once you click a production time, it will start immediately to all supplies buildings (not the goods buildings though). The changelog mentioned that if you have any sabotaged building, the autocollect feature will automatically repair it too.
Hope that helps