Will Apple release iOS 4.3 for the Verizon iPhone 4?

This is currently unknown. Apple stated that iOS 4.3 will be released on March 11, 2011 for GSM iPhones (meaning AT&T Mobility hardware only).

The Verizon iPhone 4 shipped with iOS 4.2.6, while AT&T iPhones were last updated with iOS 4.2.1. It remains to be seen whether or not Apple will update Verizon firmware in the near future. We will share the latest information on the subject as soon as it becomes available.