Beta Testing for Jelly Bean on the One S

I have been reading news all over the internet that T-Mobile is beta testing Jelly Bean for the One S; first is this true and second if it's true how much longer will the wait be before the update is available OTA? I have been looking up all the features that Jelly Bean has and I'm excited to get it!  Can anyone give me a rough time frame if not an exact time frame as to when Jelly Bean will go OTA for One S owners?  Thanks!