Arc Release Notes on arc.net:
We’re thrilled to introduce Arc for iPhone, now available in an App Store near you. Access your Spaces and tabs on the go, save tabs for later from other apps, and much more.
Arc for iPhone actual nam on the App Store is Arc | Mobile Companion, which is appropriate. Still, as an Arc Desktop user, that limited functionality is exactly what I’m looking for: access to my tabs on mobile and, sending tabs or links from mobile to the desktop.
The promotion video is a bit campy, but cute.