Google Chrome now works on iOS
But, Chrome on iOS will still be a "second class citizen" the way Opera mini and the other browsers on the AppStore.  If you want to open a link in Chrome, you will need to copy/paste the URL, no "Open in Chrome" functionality like Safari has.  For better or for worse, Apple has not opened up system-wide integration of third party apps, and I don't seem them allowing you to change your default browser anytime soon.