Please please do not condemn Le Cellier just yet. Not to berate the OP but I called Le Cellier direct, not 407 WDW DINE, but the restaurant itself and just flat out asked if the mushroom filet was removed from the dinner menu. The answer was absolutely not! The filet is their signature dish and what I told the girl who answered what I had heard, she seemed quite surprised. I didn't go into detail about what I heard since I was calling at a busy time but it seems that it was a false alarm. I didn't ask about the other items that were supposedly missing but it seems that the OP was just mistaken. It happens. No flaming here.
If there is anyone in WDW now that can get visual confirmation or at least verbal confirmation from the restaurant itself, please please do so we can put this to rest.