If it matters to you, ask. It will probably be "basic" KFP as in no bread/pasta, etc, but who knows if the details will be (corn syrup, etc). I can't imagine a host would be offended by someone asking, just don't get huffy if the hosts keep Passover differently than you do.

Depends where? Conservative+ would assume; Reform- would ask.

Eek...is this really happening? I would ask. I've seen shrimp at many a mitzvah lately, so don't assume.

Would you ask the host if the food would be KFP or would you just assume it would be?