Prior to upgrading to 6.2, by default, anything passed to my API in the body as a JSON string was automagically interpreted and placed in the RC. That seems to have gone away in 6.2 and is breaking a boat load of my code. So in other words, this JSON string passed in the body to my API:
would give me rc.userName and rc.password that I could immediately pass to my AuthService.cfc.
Also, setting jsonPayloadToRC=true in my Coldbox.cfc is also not making a difference.