We lost a customer. This is how we found out
It's pretty common on a lot of recent startup landing pages. Great looking design, nice little touches like animation - but very little detail on how the product actually works. The assumption is that someone curious is going to sign up to find out. Lots of people won't do this and will just bounce. I think every landing page should try to answer these questions:  What is your product?
  Why would I use your product?
  How does your product work?
  What does your product cost? 
    ("Still working on it" is fine, but say so)
  What countries are you available in?