SimsVIP has posted a screenshot by one of their users who downloaded the patch. It seems that with the new patch (and Generations) you’ll be able to take a Sim back to CAS. There are currently mods with the same thing. Once testingcheats in enabled, shift-click a Sim and you will get the option to “Edit in CAS” as pictured below.

Gen Patch Adds New Testingcheats Cheat?