I was offered Immunity at magistrate court?

I was charged with recieving stolen property in one state. I went to court and because I knew who stole the items and who I bought them from I was offered Immunity to all charges in my state and the prosecutor in the other state offered immunity for my testimony, polygraph, and all information about the case I know. I'm afraid the other 3 guys that did the burglary will try to say I put them up to it or I was the one that did it. There was 50,000 dollars worth of stuff stolen. One of the boys I went to shcool with and know very well and the other 2 that helped him I don't know so well. I hate to get them in trouble but I'm in the military and have a government job and I get a felony on my record I will lose them both. It has been almost a month since I went to court and I haven't heard anything from the police. What is most likely to happen to me?