I heard it, but won't hold it up to be true until we hear something about it on this board. Rumors start very easily on the net. There was even a post about it on this board somewhere started by a poster. Again, until Amy posts something in the comings and goings, it is just hear say, IMO
The rumors that I have seen speculate that someone will be taking over the Executive Producer role. Since LML is also Head Writer, this would not necessarily mean that she is getting the boot, even if the rumor is true.