Yeah, yeah, none of us want to miss new things, but I think you're just gonna have to deal if you want to dine at Palo. Do not put any faith into any schedule. And even for the "old" menus, there were new little touches every night. For example, Belle and the Beast put in an appearance when we were having the Lumiere's menu, and each guest received a Belle or a Beast pin as a gift. So, just about everything will be new.
If you love Palo and want to have dinner there, then just be glad you can get a reservation. Even with two weeks, not every group will be able to get one. There were many people on the May repo cruise who were very annoyed that online booking had opened up, and they hadn't been aware.
If you don't want to miss anything new, then you could always skip dinner at Palo. That isn't going to be any different from other times that you've eaten there.
We ended up missing a new menu when we dined at Palo, and I'm a sucker for all that new stuff, too, but by that point, I could have cared less. In my opinion, Palo is always worth it.