I'm glad you asked this. We booked a lunch at Les Chefs de France during our last trip. We dined there on Sept. 2nd.
At that point in time, Remy's appearances had just been extended to Sept. 5th and I was so excited that we would have the chance to see him.
Now that I am planning our Summer 2010 trip, I am hoping that he will still be there. We are coming up on 180 days so I am thinking of booking lunch at Chef's and just keep checking.
Lunch with Remy was a real highlight of our trip. It was a very unique character interaction. He was adorable and his handler was tons of fun. He kept congratulating us on getting to see him (the handler - not Remy). It was too funny.
Lunch was delicious, our waiter was a sweetheart (young college age boy named Jonathan - I am really bad with names, but will always remember his, because I never did pronounce it correctly

) Hick American!!
Anyway, I feel that, as long as Remy is at Les Chef de France then it will be on our Disney must do list!
I hope you don't get a solid answer......because that would mean an end date for Remy
I hope you and your family get the chance to dine with him. It is a very unique experience. Good luck!!!