You should probably scratch the beta label in your site, too many things launch in beta lately and its an increasingly annoying trend.

Since you haven't launched yet the beta makes even less sense.

Re the UI of the landing page, looks awesome, a video of kids using the thing would be engaging and definitely a way to be notified with a simpler open ID sign in c.f. typing your email address would be better, that said, I understand you don't want to be working for too long on your coming soon page and focus on what you are building ;)