Why not simply be honest and tell them "Hey, we intend to introduce these features and testing few ideas. So far, 445 people have expressed their interests, inc

Why not simply be honest and tell them "Hey, we intend to introduce these features and testing few ideas. So far, 445 people have expressed their interests, including you. Thank you for your interest and time. You can enter your email below (this is optional)and we will let you know as soon as this is available. Thanks again." Two birds in one shot :)