My Google-fu is fine. I didn't use Google to search for it, I used the search function in the App Store and looked at the Weird Worlds page (
http://www.shrapnelgames.com/Digital...W/WW_page.html).
I searched on "Weird Worlds" on the App Store on my iPhone and it didn't find it. From the link you posted it's iPad-only, which explains why it didn't show up on the App Store search on the iPhone (which only returns apps that can run on the iPhone).
It would be nice if it would run on the iPhone, but I imagine they decided the iPhone screen was too small.
I don't know why it wouldn't be listed on the product page.
I also don't know why they didn't announce it here since there's a thread on an iPhone port.