Co-Parenting

What is your take on your childs father wanting to introduce their partner to your child, BUT not telling who she/he is by name or meeting her/him before they meet your child. My daughter's father wants to introduce his gf to our daughter, but refuses to give me any information about her. I think I have the right to know who is around my child when I am not present. Plus, I don't even know how long they have been seeing each other. Last I know he was with another woman, not the one he wants to introduce our daughter too.