Google just announced at Day 2 of Google I/O that Chrome for iPhone & iPad will come to the App Store later today for devices running iOS 4.3 or later. The app will feature many of the features present in other versions of the browser, including: Chrome sync, incognito mode, and its unique tab UI. Google also announced during the keynote that it would bring its recently launched Google Drive cloud service to iOS devices.
As noted by Daring Fireball, the Chrome iOS app will have to rely on WebKit:
There will be more Chrome users on iOS than Chrome users on Android. Since the Android version is ICS and later only. Ironic.—
(@koush) June 28, 2012