As far as Tim Burton's Charlie and the Chocolate factory goes, I am kinda glad that they didn't have any call backs to the previous film. The only place call backs belong in is a remake of something (i.e. hiring a cast member of the original to have a cameo, having an at the moment musician cover a song, or reference the film in any way). I felt this was just making another movie based on the same source, just a little more accurately. It would be as if someone made a Wizard of Oz movie based entirely off the book, and not to be related to the Judy garland 1930's film. Everyone would expect a remake, but it would be completely different. And some fans of the book would want it that way.
AS for Magorium? Well, Kermit or not, I am not sure I really want to see it. I would be able to sneak into that one and leave as soon as our Frog in cheif has his cameo. But that's sorta dishonest. Plus, they time the movies so they all start in a fashion that you can't leave one at the end and immediately see another.